Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c91ecc47d600191…

MALICIOUS

PDF

85.1 KB Created: 2021-07-24 12:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f12a0c25a605971cde845c3661ad42b6 SHA-1: 4c0ea9eff2c4ee8f69ab62365ff8f71e855d360b SHA-256: 2c91ecc47d6001916950b4f79a09eca6b3786202cdf1821e938d95834229720a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, further supporting a malicious intent.

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 https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/m1iqoftv6khrdoigt98230sb0c/lorinoremo.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/298f07029519f1772ad54565ec69efdf/jamutaseriladatodib.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770f9049c59---giwevixoxa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j3uled6237kvuv68a5jrvnfh9h/vuzinogobufogetegade.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/92560327172.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/dipejisirejewumo.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/84840890867.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d195dab8b2---75499167338.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/jukovojojerag.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4apko5ttlb47isiab10slt6ga5/89153238956.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719c331d318---nizejijivumo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/629ffd527f9b31d3aee33cfd99f99967/xifujalumafonapazuxuwowo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3780e503f---33441592171.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/13495056353.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210601_032629.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/30158518234.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/93006117635.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a9574722---dipomamujazukofomekat.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/sonaporabozoderotegule.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6dbc188fa---misovakasemojatepamabune.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/tisud.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/xadonito.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/kokufubenoj.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609288505c556---72590502498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+connect+chromecast+to+hotel+wifi+without+laptopPDF 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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10920 bytes
SHA-256: 26c4e43b26913bd535eba6531eaee9c129310137a595be09e1c1d98b850ba948
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16224 bytes
SHA-256: 2432cb6addc06cacd294cc6c97b560d8bc19a3cd8055c5fcedb091c5b4480c0e

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