Malicious PDF — malware analysis report

Static analysis result for SHA-256 6989f0f79a4ed711…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 23:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4fae6daa26a3ef0c28e43ccdd397283 SHA-1: 172f0971d3fa9884562313cbc5cf822fcc215444 SHA-256: 6989f0f79a4ed711bf4bee31c60db97d8217466a9ef5f98694f190510b937d2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for suspicious link farming and duplicate object bodies, further supporting a malicious classification. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61597985551.pdf In PDF document text
    • http://strandedtattoo.info/file/nigogewijijuravurala.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/s2crpbn8pitq3svl5vemq18nii/94665827561.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e96a29b73---xulomuwu.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/pufowovogiro.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/muzoxevemotipofirawuf.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nikerigijefo.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210902193531.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/90292042714.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/degivaxilexetarowiranak.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/metunumu.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/zitijusimuzuk.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/vulaxepusoviv.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/gedefaxuj.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/fesuvofeserite.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i21nt3bc575kdece7m3ft3eqn9/52742037860.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_205126.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c114fbe8a541onjbtjdbp6i4vq/jegisene.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/t93at4q65hd83g5c2ib49h9rra/sexatomefig.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/67887644153.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/gemozezefagukopenaj.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905211349_lpone9.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/49290908783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=is+it+possible+to+recover+photos+after+factory+resetPDF link annotation
    • 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_off0000b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 10744 bytes
SHA-256: 7731979eab5ed858c05ee781e6e1b4e5a3592346155fe45b67c9b8b89e3eb486
font_01_sfnt_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 17388 bytes
SHA-256: e44f9179b2c4567a16e7cbe0043680fd1043f7aee0da788accda9938fe99e639
font_02_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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