Malicious PDF — malware analysis report

Static analysis result for SHA-256 838a34ee6c8cd435…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 11:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20acf62769164851bd13092119ceaaa1 SHA-1: 7dcb0598a8e3c2ea5f33924a49a82720ed0f153d SHA-256: 838a34ee6c8cd435f9d50f171b4fc8f0020f85e3c125ae07eb88020ab4de6395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tfh-filter.hu/_user/file/faraxosulixe.pdf In PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6fe8704e4---mabetuwitovinededigo.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/93281902874.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210721152450_1894460089.pdfIn PDF document text
    • http://ellev.fr/upload/files/88184705675.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/96695468450.pdfIn PDF document text
    • https://sanidom.pl/img/file/65206250491.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/kujugagokemidajibeduguz.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/30155508419.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/19975670217.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd0117540---muveruvol.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/37721742061.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/j3sifko4fp5c9mahi1m8i2bkg7/sibavojezunewotisa.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/gosaziku.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/82923279090.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/42460104011.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/negijapupi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/90286498997.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/18671219721.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hkovg0gkvpejs7i8vifpe9l2b0/fifutijiliwodekowipuj.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/86180628345.pdfIn PDF document text
    • http://dogable.de/userfiles/file/46877350497.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8bcbee8f9c54a9433f89de6fd0d5176f/89737666253.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/wuxeribe.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/22271803946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cours+de+solf%C3%A8ge+pdf+gratuitPDF 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 10856 bytes
SHA-256: 7df88022b08f3b872f4cea0b4b3132e7f67e34f719ab6ab75d63a89c2c42fdfb
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 18908 bytes
SHA-256: 14fd55761f48c65b6fb82109394758a2844096b4850bf5ec6bbb6a04b14f063a
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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