Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1072d18061d08b…

MALICIOUS

PDF

86.1 KB Created: 2021-07-19 11:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cf24cff87baac81795116ad49cbda90 SHA-1: 4c90f55ead24e15a6465a77e5d4afb807fc2c132 SHA-256: ef1072d18061d08bf587f37623b9808dad5db023aa9d51ae076e05d07899a0c8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, are part of a larger pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.firengo.com/userfiles/files/59006480564.pdf
    • https://pmms-online.com/assets/file/71558479786.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/jarejedovalukazilazijig.pdf
    • http://slsnn.ru/content/file/29601652934.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b23992cb1---87270997565.pdf
    • http://euroteam.vn/ckfinder/userfiles//files/fisunoxilosa.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h1ib5ntuht0a9plo87sp0lt6i9/72236669977.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0137ef2a3713f00d14bf8b905481dc4a/22068919112.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607019c313b14---vamutex.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4745406e64---kefezisirunides.pdf
    • http://18554080.com/userfiles/file/7720846372.pdf
    • http://brmc.jp/user_data/userfiles/files/96274419691.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14bcc9f39e---fuduxupu.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/keu2pgijs66kc3hoqtpesv3br3/87317641230.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d68eed3cc1a529e8a1084f3dedd2606a/fetojusapepisodukata.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/eec0044b1a0029601237c2254cad5a12/26667843284.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091139fd956e---57569890286.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/uitgqdo49v8mvktvmuvgs5078s/vimixebusifowogixifuwu.pdf
    • http://erex.hu/upload/file/vusoxafibinilifepanagi.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0d08fe55---82649873955.pdf
    • http://theheavent.com/userfiles/files/gevozotifugotasatuti.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7744fb68b2---pesipimawiwugakavogin.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5d44c0515e07fea3186c27996b5300d6/zanokarimilulapokofu.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355cb48706---ginigo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=networked+life+20+questions+and+answers
    • 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_off0000eb2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 16792 bytes
font_01_sfnt_off00010346.bin
2692f90d9b144487575f75ff379f668bae87f3a7049b42ffffb813c39710053e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 10992 bytes
font_02_sfnt_off00011cd7.bin
62db7d0f24a85698e2ff3f340524e75ac740b7f34afb71c0259ff230ad46b084
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 17732 bytes