Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef3e671a6d9a9af…

MALICIOUS

PDF

95.1 KB Created: 2021-06-13 08:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ddfa8aadfd1de2ebfd34b079ab40daa1 SHA-1: 3eca2a492002b01da2d63863d307b4e2d5d1e23c SHA-256: 7ef3e671a6d9a9afa307ac0406efbed22fdb103f46f425567115162b5e5328d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=divinity+original+sin+2+swornbreaker+uses PDF link annotation
    • http://okmarin.ru/userfiles/file/35362005346.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607288702a6e0---27573938671.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/78d695213e706ba48b66a85e7fa2ad63/62688124332.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/jijidekidajaxewogijatevug.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce8f3034f---judeforureraw.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/70551025050.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/377177c3cbb74d54fff5ca0a3341efa5/54263273559.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jakav.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/38952661777.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ab95ea018370f5776cfcdf25d9e19e9d/48545519637.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/052015177744.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508073659393120.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/folurafumadunusozuzuf.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/jugisazixulivegiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 5440 bytes
SHA-256: 5608e37b02091dd8d3c3bfc39e5f4851ded9debf7caf2151dc5e07f7ec59f6e9
font_01_sfnt_off000133ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AE 11448 bytes
SHA-256: ecb87201ee5e34b38007e9e2ddeade63c36ecc41158a856b0bc17deb29ed566b
font_02_sfnt_off00015a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5A 16192 bytes
SHA-256: b80dcff4b26782ff2bd1ed82e01ce9053ba91b1a5afb9bea673378648d26bec5

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