Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed72514ea91dc25c…

MALICIOUS

PDF

89.8 KB Created: 2021-08-07 16:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f578b3c9da887e7242ec294dfa9ed8a8 SHA-1: 38e678adda208318806e5b4f0d5778bd00569e9a SHA-256: ed72514ea91dc25cc41d16aac35941bab8773cb92b540d004bc70f922cab4c25
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/badovat.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd428ceed11---womasuj.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec077d7342---35929350478.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/wifitejokeluveta.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/39594036650.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b0db3e9a---59987790297.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c9fed431---guzogaforamirirafeberav.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/70ofmgmr81j7pencor680t36p3/bigutazebinusobujukug.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6f648771f56432d64d2d69ee34fa3ffe/94907308767.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/xonimojetunoza.pdfIn PDF document text
    • https://mimpidia.com/contents//files/34835145081.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835e403c1ed---23593694072.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab306aa06d---xalefemoselajakep.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/redodoronowurabarovuraka.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc1cb4383---dagotesoxupunibepizivabi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k6qe1glj22qu6adusb73se9bhi/wobotamapejuguxof.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/64639945604.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/vatojexilafutumo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/29153ee3c91cffa7441e4c94e2460fa1/zojemusikop.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/85989951299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=snake+rivals+mod+apk+%28unlimited+money+and+gems%29PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d1dcbf8b26761ca9f1352d5d5db1db06/99083001279.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 17688 bytes
SHA-256: b742c626611afd9f3f8bcb216508b95e3d23e12ba652956cc77500d52ac56883
font_01_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 11340 bytes
SHA-256: a21f9760e4232d4ea4cd4dcde6df85d457e89be6186091e81d20ed26330522d0
font_03_sfnt_off000140e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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