Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a37ac13aaa5e84…

MALICIOUS

PDF

165.9 KB Created: 2021-07-04 07:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f66a42f4074b41eb08f55b87fc90494 SHA-1: 4c8cea05c876cbc88e11528f0b81ca202631ba29 SHA-256: 27a37ac13aaa5e84d73d05bb49736cebf8a97b34d3ec0a5680af0cf631c44722
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

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://irlanc.ru/uplcv?utm_term=law+of+torts+llb+1st+semester
    • http://askort.pl/Upload/file/bejuf.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/93793e4eb2e299072075a2703dbf2cbf/galobixuwufagomekokitoji.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb864fcd1---dexure.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f91ca67fb6---guxowebig.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244d226389---5030024485.pdf
    • https://bandai-k.com/userfiles/file/22204764887.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2b4fae204b97d0490b8fed9a8d1a2284/8211364353.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/40ed5fdaae83f753a55aceb3885ccc83/54684999641.pdf
    • http://nsfeed.com/_UploadFile/Images/file/kulape.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/87d0dc7b7deb95989f18743fabc8504e/gigumikipoxodop.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dea4e73e52---72198874686.pdf
    • https://arerp.kr/data/file///60351690598.pdf
    • https://aimara-bg.com/userfiles/file/97329592355.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8ac605749c4f8a4232f3bfe1edc13a48/pepujotirox.pdf
    • http://thongthien.vn/upload/files/tisenoj.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608507e9b02f7---16114548144.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/crk1opvjnl2tue0oiovgi9r09r/74240920874.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1e320e8f---wodoxuwuj.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07a885915---pugubofipufukibesurew.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ed5f72a594c7578941b1244c49b1b858/99573189749.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4723cbdb820ba5c53a2b122a9d5d7d0c/20573237731.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca159bd881---74454498267.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b0f12967---zukuzeraka.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4uj3cvatp4hnrt3sps4a4a13q1/pezolubabaf.pdf
    • http://billsky.ee/files/file/79685826854.pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/wuxobepugobajeketivowi.pdf
    • https://rb.gy/s9xbzh
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022c08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22C08 16792 bytes
font_01_sfnt_off0002441f.bin
ec6eef18d10583a627ba11ad0796a0eb9a6ee41f70281e2e06c9fa5464d1f319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2441F 10412 bytes
font_02_sfnt_off00025be9.bin
b58737906890f5933d673e660346de275bd9d7ae4d875eb0dfef9562ac1bb2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25BE9 17608 bytes

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