Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a3c8e6c2952e1e…

MALICIOUS

PDF

96.2 KB Created: 2021-09-05 08:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fac1b25f95b63c4fcebc602495c5da3e SHA-1: a91d3d1320d86771239f5c60301be075d2a8261c SHA-256: d7a3c8e6c2952e1e176b637cdd0944d30c868113f5a83d352396dbdc996d75b3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1598.003 URL/Domain Information: Link Targeting

This PDF document functions as a link farm, containing numerous URLs that point to potentially compromised or disposable hosting sites, likely for SEO manipulation or to host further malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a callback phishing attempt, suggesting the document prompts users to call a phone number under the guise of a billing or support issue. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://twapp.freshkon.com/upload/files/vemelo.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf724f189---7869773399.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/11169633242.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zexafedipifaven.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/67e9c7ce1d31666f143b1690018a6306/51642176928.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/50318794033.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/58248232466.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/96656366803.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084cd1171d---55590621070.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/42118158634.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/79484369597.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/kuvuxujiwomilevifubum.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/23587844979.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/74266150603.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611084125fd26---furukununew.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e43f10a95b---2090700351.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d5fc74b5---51319851510.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/9355695006.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56331c9cd4---xalavusexolekopin.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad86ea021689135eb37cf9ffdde7552c/99698373691.pdfIn PDF document text
    • http://zuche0551.com/upload/file/37123521078.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1444f2438---67464130916.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/zuwanuviju.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7046338453.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/38691253451.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/kazijerumus.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads//files/202108091910394266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2017+mustang+remote+start+manual+transmissionPDF 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_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 10800 bytes
SHA-256: b004d9f9df2d5f59759e4ef6ccdd285c60a05cfab83a6726f3202c0ab2a8b915
font_02_sfnt_off00013ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED5 19532 bytes
SHA-256: f72bb7ba54016338e4f629efe50f9073450a4be81ae2c9c143d6c798791425b7

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