Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ca60a6c806e6f0…

MALICIOUS

PDF

114.4 KB Created: 2021-09-02 13:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87cd60c61a3c7389ab52e7af69b906e7 SHA-1: 561fea0f0e0e491e5c2888ed6ad2d568709297e1 SHA-256: d2ca60a6c806e6f03bc77559ea72981e7641195674115f8b9d34420b654435b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=libro+oncologia+medica+pdf PDF link annotation
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4641791263dc1afc3ffab6614940dd7e/nuxejitewivununadusobi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uk3q5ui9bmd44m866silau6tje/79091774893.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/l6cco5ucantl57aihr2gfvk7lp/vasixelufetagamutip.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/wapixoserobemobulonuj.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/20070224176.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jivobavipujumekete.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/67206494745.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/jerekova.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/nulumawimagozalunuwitira.pdfIn PDF document text
    • https://ckmandarin.com/uploads/63959059025.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6c8d7a30572f7cb00fe72ef5bd5f4e8e/wedupopilobadopovego.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/digapadenusujadasegowojo.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607daea75c195---47096250578.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/haql23dgic8dj4nnp8a4n4i06f/kugelimerivojiferewufaf.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/94395181946.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/vefuzakexefupotote.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bbf8bf4b0---20995119229.pdfIn PDF document text
    • http://coumert.com/images/file/35429853757.pdfIn PDF document text
    • http://beateromer.com/bilder/file/debewanerepazeluvevekotu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d177357796---detabipub.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738d8f867fa---37535320631.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160984a1bd607b---20634718510.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8da70899a---desasetoxabo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1610ccad08bc8e---purarumajolujoralebizun.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16126dce0c2e6a---godaniturosikokataxo.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/78756405407.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f3sjakl10po9tc5vp89mnkfsr2/51919779669.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15675 20212 bytes
SHA-256: 41efc0176c6a6ba6129097a52d08ee951a84e3a68eefdcd4ce7bba027ea9ba1a
font_01_sfnt_off00018b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A37C 10792 bytes
SHA-256: 81a05aa7f86063561dfc484f3f4914958599a32e04aaaaecda5770506ec23c19

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