Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fb9ce44bdcb3e3…

MALICIOUS

PDF

95.0 KB Created: 2021-08-21 10:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31c4c753138f49211bb462988418ec44 SHA-1: 3e4ae0c0c148f2e3533006cbf6e7abd8110e3406 SHA-256: e6fb9ce44bdcb3e3797c210793e150c8fb525c72e3b88de843b6e16ce31ce296
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724d78a5b2d---45707511654.pdf In PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexumametopiridulakezi.pdfIn PDF document text
    • https://luminex.pl/upload/file/vatumasunevagimovub.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/febojizurizaxixixaguz.pdfIn PDF document text
    • http://101balkon.ru/upload/files/53872882749.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0c20a593287e658d6b6153610047adba/40814742372.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/zifixidupuvefud.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/joneloselotaji.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/32817779736.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/tosaratomerazifux.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/wigixuvovozemawalubo.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/73807964572.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfe292e5f---kuvodizolodidanixajiz.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/71942670312.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3d290cbccde9864063e052ad61e5ab82/futofu.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/misuru.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/28066661534.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/374edfa4ea06e3e4ad184a88edf65999/nafugituv.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/64727506710.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a56365787f98402dc7f4d252b2ba9066/38647831847.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/vexezup.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbff3405169---51131465635.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3912c9d59f---suwedizafirenepitovunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tipos+de+historia+clinica+psicologica+pdfPDF 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_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 18612 bytes
SHA-256: b4a71822254f9292d1fba9a10c424a303b4b2c8d0c3513cb72fc6859fbabab80
font_01_sfnt_off00013bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 10864 bytes
SHA-256: 27a2fd8a38083055ea173955841cf90f15187ed77a757fd88fad07f1e229950e
font_02_sfnt_off0001549c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1