Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cc58dc058bbffa…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 04:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 56ab0baa60e8d20b3f2eaf7fa4f585c8 SHA-1: e17b9813b8bb58b5dad6059778d74405a862d221 SHA-256: 52cc58dc058bbffa755752a5335ac0829f371c20f0b68b888f7c69eaf9e363b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common technique for distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to download a further payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://kamienneogrody.com/userfiles/file/ligug.pdf In PDF document text
    • http://atenngo.com/admin/sites/site/documents/24513654989.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/55rtfcgpd7l3jl82t2op3lmh96/90102256584.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/luzurifemozanase.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106150426581142.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/mexofewapapanekuliwozekat.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/83400320270.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/ziguwivibidivexasinamu.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/bovijisinofefeg.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/jopujawawujinoxomebowonu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/61222633804.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d69209c2734---58744616426.pdfIn PDF document text
    • http://duralinealu.com/upload/files/65917040845.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/tutosaromiguwutupop.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c472367a---silik.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fedc6ca2a48---susivanidix.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe91a89711---bedobosaruxesi.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/2528686943.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/11rlb5f9bc2uc4g088dj76teat/8644245610.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/zilifanumaxixepiba.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073b54b6b1a3---96259359641.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/15423112557.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/pikibesod.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de71c32048a---regujafigesiwa.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e83279a4---guzobizizokosoditodo.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/nitawuped.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/91872766107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=substructure+of+a+bridge+does+not+includePDF link annotation
    • 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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 16608 bytes
SHA-256: 6da48e27ca2289ffa456822609ba8f114953cba70864788e5fcb86554d940b02
font_02_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 10968 bytes
SHA-256: 31d49e3d20e5a0d341d0c32b33e98c8436eb6e0355636428b5d5269a0110fc47

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