Malicious PDF — malware analysis report

Static analysis result for SHA-256 3277654e525e70d1…

MALICIOUS

PDF

101.9 KB Created: 2021-09-02 08:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b888ff4927442e72357658b7db22d938 SHA-1: d7441cedcb11fba42af0f5b8e2370bc31916fdcf SHA-256: 3277654e525e70d1c4e95489ad4007b44bb9434bfa98469e1be0d35da330a168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kopmr0gha2k991gpk6jjjfenm3/wikobiburixofedu.pdf In PDF document text
    • http://minicabii.com/survey/userfiles/files/75350325868.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef9c2355f---68998019168.pdfIn PDF document text
    • http://dogable.de/userfiles/file/56891252674.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb245c287b---vadejonazuxag.pdfIn PDF document text
    • https://eslms.com/userfiles/file/zidomuvolob.pdfIn PDF document text
    • http://yilip.net/userData/board/file/nagibasube.pdfIn PDF document text
    • http://keacg.com/upload/files/suradawaselosenazasiwowot.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/puxawelujujalow.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/winimapo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608606a5ac76f---gejekusuvavikevakazupora.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/fovanuvofiju.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/zaveleronexu.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/pinetinujuvuwitezog.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3522a4a5---sajuxozet.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf9b0c510e---fatosa.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/241869874.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/88239545973.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/04dfa8724699d9d1b1a71f5e37de9e19/436217080.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/47983424768.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850d67b0b7---74023320206.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/tuzazifubokokuzitiwivabo.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/22862080634.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/wiratisativorowedivaxax.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/53075343365.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da1dee50d1---gufegubofuxuziruwefow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=division+1+volleyballPDF 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_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 10276 bytes
SHA-256: e7927eb34e28ff3d390c5b92ba539a7a62e5eecba2c61dcb580f8aa5ea54246f
font_01_sfnt_off00013fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA3 18436 bytes
SHA-256: 42e33b79274e70bb1ec61a1771900d05d50b218035ac91bf39a9cbf5f46fbc94
font_02_sfnt_off00017081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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