Malicious PDF — malware analysis report

Static analysis result for SHA-256 b007282d0608cfbf…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 15:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f6b7d8025f3f34d9151b5ca30f0cc71 SHA-1: 0f3c106e17ccf1c6700c7f37e8681bb800dd73c9 SHA-256: b007282d0608cfbfe5573b6164436d2cb20b9221e8fc844abee5a4625111a916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the conclusion that this PDF is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=belated+birthday+funny+gif PDF link annotation
    • http://tahyuh.com/uploads/files/202109042016336437.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/91741917327.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/melowezojiditafuxo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3989d76ac884f322daefa7672cb43297/jesulorevipapesitumimuw.pdfIn PDF document text
    • http://autovoda.ru/upload/files/satogenonubu.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/37995693849.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4ed2407e147bec4b5d87b15fb1335605/79653477290.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b43101b268---jijibokozezisag.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109191610006223.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4187a093---72594165542.pdfIn PDF document text
    • http://belloverde.net/emailer/file/67507755109.pdfIn PDF document text
    • https://cowik.pl/upload/69608383099.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/19975426635.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/vajenilato.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/50931255022.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///sujivedepejuwo.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/rakumiw.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/zedozevilogatanobidoji.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/43d61ea4ebaec07d030ae97caac071dc/715190743.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/31726551191.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///43486535777.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/vemixusodosev.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/wekufexiseragimopopiv.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/2841693611.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/38799376862.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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 16384 bytes
SHA-256: de9d3adc5a77518ff11c23d7c6da5b46c8e2bd9abb97ad2355a745ec78453920
font_02_sfnt_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 10752 bytes
SHA-256: 5bdd871d6cd83ff8dbe84ade2e6fb1bf8128cc41ad57d886b7034266f28ab637

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