Malicious PDF — malware analysis report

Static analysis result for SHA-256 0469509d5967412d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 19:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f66f93fbe2a90427bfa3f3a28214ec28 SHA-1: cb81217137892dba441af2212806dad43ed88e63 SHA-256: 0469509d5967412d253fa91c504edb4d86c59d0241538674fdc6d19edd720970
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure, specifically a callback phishing attempt. It includes links to potentially compromised websites and a URL that, while marked benign, is part of a link farm. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains references to URLs consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://officeharbor.com/pdtInfo/72846721947.pdf In PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/gotaxiwavedusurijato.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/4222072565.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11268925884.pdfIn PDF document text
    • http://servmed.net/userfiles/file/liluxegom.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/10065823613.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/82614261921.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5df1498f---sosenuse.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///31436485955.pdfIn PDF document text
    • https://windsbs.biz/files/file/66263154911.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3e7b2b54db2782951561a1a836b02739/gesatukezababujidumomudep.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/vibuwituwugifiguj.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/nusorijixororedov.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/88fcc6463b5fec2c1c844954284961e4/mosepiwuvisokikibazid.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/zoniwebogoze.pdfIn PDF document text
    • https://photofetimages.com/temudipobovinigirusorejo.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/sesejoburu.pdfIn PDF document text
    • https://ms01bet.com/contents/files/40854004965.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9160eff---zogofazidatap.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/matedafisevad.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091603185754.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b6f875740---17007480354.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/petovuxetezutidokikizuru.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/63118246148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+your+email+password+on+your+phonePDF 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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 17952 bytes
SHA-256: 1624fdb6048a8ee39a2ba28723d1db4e93fa32f455e80c27db67f9cb5de7dd46
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 11252 bytes
SHA-256: 9b6470c7bd9199fb19bc82c2b10333f0298788a6a7f1a7cbe4eb6f23b12fb0c8

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