Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1abc0a362e37b1…

MALICIOUS

PDF

83.5 KB Created: 2021-08-25 16:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ad4d70af0dfffe726eb5dc881900f385 SHA-1: ba62894107b2528800c5e3c6162a44346dd785d6 SHA-256: 4f1abc0a362e37b19341b8609783f9c94a0f281b917cdab06cc65c0de7c125fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.colormotion.cz/UserFiles/file/ruluzatinovezo.pdf In PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/12296508498.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/raredopikowosezunenujolan.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210801024333.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/bavod.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8d8dc0179---81914316113.pdfIn PDF document text
    • https://dm288.rs/slicice/file/50279672935.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/71107220083.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f6b34099---bebibuxegumesebufakul.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/favedofanosagam.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d48a5ccd---47046482336.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c92ef157---10895843002.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xedesiw.pdfIn PDF document text
    • https://csodamalom.hu/files/files/21120788605.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4a4357a2fe8359ad98dbb81ec2d62472/653867635.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/81968461258.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d1f8e2150---99344285091.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/24484287083.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4e755377fc00b1124100de8ea937876e/85981785070.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d353d6ed82---86321046661.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/38218133316.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00025d9c9---34922883173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+many+bottles+is+4+liters+of+waterPDF 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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 16968 bytes
SHA-256: 352cbede517d3deac32f02badd7bfc39946addc7c023dc757e31c0e5251bdddf
font_02_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 10784 bytes
SHA-256: a7d75261b944190d1314fecb66dbd386cc8033b398a4ac4de755760d10176762

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