Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3d899938c6c246…

MALICIOUS

PDF

90.2 KB Created: 2021-08-26 14:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a43969fa64b3f7e929b0f6b71ea1406 SHA-1: d95372bcb08430b6686bc586df696419efdb6db4 SHA-256: ab3d899938c6c2461e084f8540358c47b94c3de17e802438d07aa94e6976e787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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://szpitalstrzelin.pl/userfiles/files/demojininupos.pdf In PDF document text
    • http://giustizianuova.it/userfiles/file/45567524693.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41dbd118dc---66283114638.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/nujobiv.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/56724660681.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a10847e594927a7286be7102ba94448c/75800864391.pdfIn PDF document text
    • http://leancenter.net/public/default/ckeditor/files/70438674055.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/dapanedabulopi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/c82loc5mp9d0q0d7assav4vdom/raduzopoxetikapavibiwidaz.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dusojokovonidova.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108157200b8e---pepetotixenufoluk.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160758087d8700---99932230030.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/wepipagivogox.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3k61o180cfh2gdgn4baokn7d9/surodonidufudejozu.pdfIn PDF document text
    • https://grandegroup.net/files/1923681913.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5c36ebfeda8cdde942c7134414175c9b/jelukixu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/defamusigof.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210629_444039968CECE320.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e1a756e---28792213548.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d6d523d73fab844e610d8c0abeaa9a5f/77924100582.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7a3980696131372d44cdb5a2e5c950ee/7529322480.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2222bc9789c96eeaa34ff89c91a43f05/wewoven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=in+functional+decomposition+the+data+flow+diagramPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 11204 bytes
SHA-256: a1e223ca3cbd3703fbac43e71e1a7d94c6edbc30e756b70c1acd7040fcf54a4e
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 17568 bytes
SHA-256: 6eb92bb2773ab8a141e3bbdf36f32baeda43dba5c0d2f3716e851a95e4bac6a7
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 18100 bytes
SHA-256: 38148df8e59a7f28c6f8d16b9423acd06c34b77bd9388993b284a35c50e8ee0e

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