Malicious PDF — malware analysis report

Static analysis result for SHA-256 6183e6c25613417f…

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 17:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88d5d75dfd68746f47f7a939b849f879 SHA-1: 992e03dcf75fd418b6bfa5de580d0af6b13a66d8 SHA-256: 6183e6c25613417fe2b4e7d9f20cd34eaaf93d65617c0de9ba71e20bc93f008d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for fake issues. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised CMS platforms, suggests a potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jhferry.com/data/fckeditor/file///58866654831.pdf In PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/kuxokepu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b76a54b4b28bea9c468a2d80491ff9cf/84378602314.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/91434874733.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/1180417376.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0efe38pfr3rn5ue0lgfig1mcvo/nutasugolovojub.pdfIn PDF document text
    • http://derma-dts.de/files/file/bisevum.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8739d0d1---zavuwagewuvavipuka.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/45313548430.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ee08b4e24f8f479ac83a02ae9b8f6e80/72546320704.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/89017255749.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/b186185b133c6e73408bff86ec9eed6a/xavaruj.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69ec935db---xejevuweluvo.pdfIn PDF document text
    • http://sartor.ru/upload/files/75166725775.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/35239202546.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/51da3b06ecf207bacc4f46f0f99e803a/bapugoganumawosukod.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/e6ea4d0457f072258538d1a58659815c/niwix.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b3118a5191a596f8b00e66eb74943273/34409510012.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608774a74b8d1---gametefi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42a004b596---fususukobupapuwogijat.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/fopaboraxuwupagutoriz.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/jikabonesuvozerapo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/d163q6mk118e2qm3r6fsavmpc2/rorotawoderivim.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/5399517521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=jain+old+age+homePDF 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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 18128 bytes
SHA-256: a5b582ee0442f2ca80bda2d0a606b74405919015d0601f8d38bb6ef03a57af4c
font_01_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 10320 bytes
SHA-256: d0bc391da3066991cef72a1bbe493eb2fad57248bbf94bae14ef81471edce6b1

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