Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4ee4379969cad1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 10:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc1388dda71c6b1a9ad55410d1c72f5d SHA-1: 439ae8ab93ca7b5fcf813acdaea73764b1e5473e SHA-256: cb4ee4379969cad1bb8b8af1f3ba5012d96b8e5f9245767e12c6975e1657084f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm strategy, potentially for SEO manipulation or phishing. The presence of a 'Callback phishing phone lure' heuristic suggests an attempt to trick users into calling a number. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=best+phone+multiplayer+games+free PDF link annotation
    • https://hotelcorona.ro/files/92219628043.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/9393118318.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/he83qc9h3gj7s2o77qnpnkcs41/mezenexu.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/46744276505.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6da8fc93---86837037043.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/5161244954.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/78665470490.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb8247e31---14461630931.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/jetesusisojabu.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/sumafojebamalobobapeg.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/12890293157.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/nasuga.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/93241099589.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/mizaxebum.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/nadvre4cgfl2ilvg3770f721ka/mukosetixetumin.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/10771715978.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zujus.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/51965825274.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/12206167034.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/30513808230.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///puxonekodefokamivezomo.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/11087530600.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/fawinebizuvipunuwedidere.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_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 11072 bytes
SHA-256: 16767f6c1f25429b333f0c25108f18a18c7052546af0b9ec27777240d54bbe4c
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 17616 bytes
SHA-256: c6b6484b07582694e29db56e7b51b93e1e1a6b49e709ee1f88219bc08a859c70

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