Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f882bed2265e74…

MALICIOUS

PDF

92.8 KB Created: 2021-09-02 22:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 10fe016a0079baa2704dc1ecb6eb833a SHA-1: 24ca800660de4716e1f4c6340b725bc57e753c0c SHA-256: 35f882bed2265e749c8a3516fe98971076a10e1317012644051893b6983a3e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=telugu+vyakaranam+pdf+download PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5p5ediknsfo67eq6nkock9ap09/monuwibomofubakawovub.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/38492654459.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111b130ecf61---kamoroverunitufavavuboke.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5dfec0269---22292232030.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/83149d3bf4d6c9b95819c72b09a9a0dd/27238821133.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fobesemegusaf.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee06d29a94---tetitugugatunitap.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/20788e2d8e134b539561b148708a505f/xomomobe.pdfIn PDF document text
    • http://hejia-ele.net/upload/1020197424.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/papuranaxeg.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/45584106882.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d1d184d8---labufonifozibupafarejow.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/71735633044.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210828_72cd4.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/fufifukusoxofir.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/joguw.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/vefivekuvas.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6dccbad55a3046064cccb9543b3c8bc0/viwekiweziv.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f31920088fba22d2ddcc99865ac7d569/9640395225.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/5348501688.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 24536 bytes
SHA-256: 22c9ca599f0d0d25e6bbe42c6525169aa50b894a16c2171767894d7a7d8487c8
font_01_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off000133b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B4 10904 bytes
SHA-256: f6f310cb3380131746b28ff21e1e7000453845039a6a363589f97d57acd70dee
font_03_sfnt_off00014cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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