Malicious PDF — malware analysis report

Static analysis result for SHA-256 4915b6282c5dc481…

MALICIOUS

PDF

89.0 KB Created: 2021-08-08 14:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea8b4bfc71f30992d40ae69d164d7d6b SHA-1: fbfb5d93d601c62015eb96fed96d0108c25bdcf9 SHA-256: 4915b6282c5dc48122e114bcec289f3333c57e265b3879e2adff3c3ea83b9332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a campaign to host malicious content on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://crewmak.ru/uplcv?utm_term=functions+of+adjective+phrase+pdf PDF link annotation
    • https://eslms.com/userfiles/file/zenuxut.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/mapagudosesebex.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210713213454.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/mizanazebag.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/libazis.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210704054948_5gylop.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/51i65cpgs1ehe1gblpae7qqse6/kuliberejigamopuz.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/20258739526.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39503718880.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37340bd156---53387647444.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9d5926160---33540247075.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081109ee09c3---604709129.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab637dabbe9---towaxonox.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/25d8at329cbsebnrbcienv8er1/nuxefupojaxujiwezevivene.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/ziromiro.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/dewadabenep.pdfIn PDF document text
    • http://flirdining.com/uploads/files/74041746470.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd9f0dd6e---73968459137.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/32612396641.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/namosakesuxopalusalevak.pdfIn PDF document text
    • http://abpaluso.com/upload/file/defod.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 10944 bytes
SHA-256: 58f86aa7c1ffc9089f2ada727423840e54e241ac92ae9f59510b1644f455d8f9
font_02_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 17080 bytes
SHA-256: bc398d2960077a0b0029d8d13cb0b355192ad5a729295187b1f06435895638de

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