Malicious PDF — malware analysis report

Static analysis result for SHA-256 162d580fcc407f8c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 11:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a52eb741b6849a0aead343eeae63a2fb SHA-1: 13860ceeb63e1ca82a357b6dc4105289e02e2baa SHA-256: 162d580fcc407f8c17c1ad5dd2d5ef5fb0991e76b16704d43e44632c8092cf56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL, 'https://inwebjor.ru/uplcv?utm_term=are+apple+phones+safer+than+android', appears to be a redirection service designed to lead users to malicious content, likely a phishing page or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://inwebjor.ru/uplcv?utm_term=are+apple+phones+safer+than+android PDF link annotation
    • http://www.jasolasia.com/image/upload/File/68588875031.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gekebamabedamelubefijuluz.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/tafikonomo.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/tovezapoluwe.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/lakoxazanutegivotisukuziv.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7040c58f---43849508662.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/sejakufujonevonugopuv.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/3504882047.pdfIn PDF document text
    • http://hanauhrova.cz/files/59423021081.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/45552025914.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/pupixaneregejefuxifiwej.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/buvimo.pdfIn PDF document text
    • https://tckontrola.hr/files/91592768426.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0e432840---62000995096.pdfIn PDF document text
    • http://lgassociates.in/uploads/97892971986.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/tajerozegezotusazenad.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/47171673113.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166c288a35---90026012174.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/xeronobetegulor.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/17234239217.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/20469686149.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/berol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 10576 bytes
SHA-256: f5c0b1446b2e0ad2e8ca6cf6690c68223ef9f2c2497c8b6880db0bdba8d509fe
font_02_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 18628 bytes
SHA-256: 2ca17de1a65e0adab18fbc90b73208348616fa6191384934abcdcf23bf30643d

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