Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafb1a03b6c09272…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 21:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ff3eafa163347feacd78bbf4a1e776d SHA-1: 02edc275bb07326b317daa07f52fb99bd275a1c4 SHA-256: eafb1a03b6c09272e7fa9044c48d775f595eddb54273de78f60e16a8f595d297
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://muacuoi.vn/Pictures/files/71687949456.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3dd7145a---fixoxaravapes.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a0bd47a2d---teruninuvoxujagazava.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/57242591688.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/7526332956.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d25b7ab0---13804798948.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/89079605267.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ccbea7344---pemuj.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/38640814812.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/kitarof.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161334e2ebe17f---wixeranoxipigulevuxuxezaw.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/vofelasepavatoborusema.pdfIn PDF document text
    • https://gulamanis.com/contents/files/51631804211.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/84607530621.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a320469afa094a344eb25ead57b9dcf5/93423689427.pdfIn PDF document text
    • https://anjingliar.com/contents/files/45334901741.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/tuwaw.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/345e7d12f491fdeb51c081b18b1abd67/widudesilitaxurotida.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109081111271544.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614144c6a91b9---tosogisajud.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/bofon.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c458fe9a0d---87724150242.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613515cc532e4---mumupod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mk11+mobile+apkPDF 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_off0000bd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD64 10220 bytes
SHA-256: 6236d0ae199642af45c8ead1e0872ec3e29a6aeaed3ebf0442adf26e6c1d1fb7
font_01_sfnt_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 17500 bytes
SHA-256: e4b4f2c2901b17928153c5615da4fb7a3fe8481569870917fa31378c15feb7b0
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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