Malicious PDF — malware analysis report

Static analysis result for SHA-256 401fe37c2a2004d5…

MALICIOUS

PDF

92.0 KB Created: 2021-07-02 07:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b09e16828bede693c30ceb5151fe29f3 SHA-1: 1d3d7ce6b0541997c3c41a196b784bcd6cac887c SHA-256: 401fe37c2a2004d5e7593db483c1d4c1aacee917384ad11072a543a19e43a54f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://topas.lt/userfiles/file/niboxiwafa.pdf
    • https://mimpi1pusat.com/contents//files/tesoxogisuxater.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba294eef3d7---xutabenuxu.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e276d9786bac2cd0b1d3efed20cd998f/luwirujizorosanadavone.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0528rcja55mcdf9m02oqnm7kp/jipinebesotiv.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0be29300---5775701178.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082611acca2c---panupipivimoro.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9qhjbc75qddgbh7c8i9oek8laj/94126147215.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbf9beae7---69167159603.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16070db8c04577---92487520277.pdf
    • http://learningkey.org/userfiles/66405447392.pdf
    • https://lawyerupsmart.com/tempimg/file/rerejaterexomamuponugegek.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0l2iefbbbq3k2k7a2cslota96g/newulo.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/55284977772.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/8458943166.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fc508fd05af27cfe6f747d0b7db0c93b/56427406636.pdf
    • https://aspaeng.com/files/image/files/60275137163.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b0880a06979da8b25179b32a4c6d9bbb/wenorej.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c0a30bb9c---xufiponiwamotav.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0736320c6---93472982421.pdf
    • http://twtipa.com/upfile/files/2021/06/30/67986703855.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/74693b23ce4ce25a5bdd93c212fc3d45/dibigetidi.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/51f813359c4b1db0106af9e53ba83b37/82507891955.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e710f752e1---xixovofidujivib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=opposite+sides+of+parallelogram+are+equal
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 16792 bytes
font_01_sfnt_off00010343.bin
7d021a1735e72e2d4fd16d1750f0e82041cf66baca08667ccfe38d67c512953f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 16224 bytes
font_02_sfnt_off00011919.bin
f1d24745005db8502e65b5af63860e87c1e0a476fb72c098e9f2eb934719eb09
pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 17888 bytes
font_03_sfnt_off00014882.bin
2412373a4535af6a12598c90945ba3756940971641da2ba9925eff01ca10efae
pdf-font-stream PDF embedded font (sfnt) at offset 0x14882 11008 bytes