Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ab6ab811132ef6…

MALICIOUS

PDF

83.1 KB Created: 2021-07-02 21:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ffc2ca5b4c638a88a075082cea07f664 SHA-1: 177558c8ace0af02327fd7659705ab0d8581db83 SHA-256: 27ab6ab811132ef621feb51520d12fc526ffd7516982107bf859ad3d0992c8ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL distribution suggest a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://applecentervn.com/uploads/image/files/4858591505.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/11459446944.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b918bb41357---lepuzevosav.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/22861408654.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/15185007855.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/98208840094.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/zezinexi.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/vifojojafibuzifizaxisus.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842f264fd9---70905859332.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0dbd7736e---jotusajetanunokuraliju.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/22985436797.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/906370c3e0f5a1a6f34938a58f3435f1/litufisajulozasojofater.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/91d17e4fa457603a494fede8d7fec167/48825829352.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd57e42a05---budoj.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3ce15e2a---99795076736.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e905c87c3c90af8f1e5f3aabf969fbf1/26153015333.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a9d4e1a50f6a018c848a508101a379d8/farezuboxuwukofeja.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ede337071386171c772cc582e6da7356/73966844438.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3f709d03858bb3a246c12466da6e1b58/52972088907.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gefonipebebovosurifezir.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/894fd76b625adec582b2fcde3204e488/15274363748.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/71083023532.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f174c22dae---31598285456.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/beweb.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9590497de3---dixemematejabiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=types+of+osteichthyesPDF 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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 16312 bytes
SHA-256: e539146834bbc04ef6747886f2e922197da9bda1886ec2e0b550d42aa4c1f35c
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 10240 bytes
SHA-256: 75cb1c22b339f137557052b254f217e2a1142b9d377a0e5f1973abab1adfbd4a

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