Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6041bf1c150be72…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 07:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff1e6a61264c3723aaa953d1d7aea1ad SHA-1: 07846a4ec25a0a47ce0ec1a7aeed3041c298545d SHA-256: d6041bf1c150be72cb86149b0776d830a37b10ac607b92b6f04c2cdfdf53de25
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing pages.

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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/32de10ed435f77c77b38186c440503be/56514408214.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c026ba37c---nekonu.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d571c1d998---48226004104.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/nvd6p83o5f5r977lkrhutjgo1l/72218417726.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc100610cfc---podete.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bd2e6ee30---85620987583.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c2fe31ea---gufulaselajufuv.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/xodizuzisinep.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9eaf36106c40e9433df16d8c49b0e355/33840118491.pdf
    • https://guineaservicesproviders.com/gsp/files/sedanipopemox.pdf
    • http://busanpc1.com/upload/fckeditor/file/42305963408.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a20e95f58---82298326902.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da7569d1---jovidu.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/sesejemilop.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47bb77c496---28701506783.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/mujuzebosojoninatujazaw.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e858950d3c---51653135489.pdf
    • http://sarljarry.fr/userfiles/file/47079637137.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609579a5e0aca---80552802487.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/743f696d2ad0f7af341ecb644b58f842/63952796100.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b737b5bb6---mulanaxamutazuta.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/81f56f6bff227457283e386e85daadf1/jinumukadajiwoti.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/j72f2qh1u85atmt71mhi1tiio9/82488563640.pdf
    • http://ablerexthailand.com/userfiles/files/wudekodadexegiji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what%27s+the+purpose+of+law
    • 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_off0000eb1c.bin
b374ed77d8da0de54c6e9ff41a6d8a67f0ddbdcbfed9c97981af9ff1adda3e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 10472 bytes
font_01_sfnt_off0001032a.bin
5ef4707b8e4ec02e0e8d3fd8b8d361b7b46b9255c01194466a42bac746366d30
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 17492 bytes
font_02_sfnt_off000130a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130A9 16792 bytes