Malicious PDF — malware analysis report

Static analysis result for SHA-256 622734b204e6ded5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 07:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 229b366805ee44b6ddfcc5fb2f4cb20f SHA-1: 0cf7e72b47ae6a1a9e95f19b7bf4a03a136e536c SHA-256: 622734b204e6ded5c6ee8b2460809f00a82bc2c282cf3ce8ed41182584f4104c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the nature of the URLs and the ML classifier's high confidence score point towards malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=synonyms+starting+with+letter+a PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed02d3b25b---52777101381.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/30440097346.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/xozimijininoxubor.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/38332750323.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15165152914.pdfIn PDF document text
    • http://888chji.com/userfiles/files/65931356978.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/85958408898.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc5cd99bd0---35457875910.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/magizerigejit.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/76564695824.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb1994e8d---24496696668.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210914_1B810013C77B7452.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/dubixirimazuvikopugo.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/zaxiwig.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/nigijiratipedonozo.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/betegadoniwize.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/3748018883.pdfIn PDF document text
    • http://krupongs.com/images/file/68479004683.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/68628905257.pdfIn PDF document text
    • http://pvvc.cz/files/53968127174.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/96606228855.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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 18736 bytes
SHA-256: 7ee5a71a98d3be6de44ce332340616331da22939416ddff66b5d92d916750f8d
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10828 bytes
SHA-256: ae609e6a5f2e3235f99b1c079ad00a2e5bee9a76341aaf0fea3a8c2c3f451779
font_02_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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