Malicious PDF — malware analysis report

Static analysis result for SHA-256 3674da3f783a3bff…

MALICIOUS

PDF

95.7 KB Created: 2021-06-28 02:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3290b22f3feff10f302a10071427dfe3 SHA-1: d814e6801ce7be61d6c22e8662e08f9746e647b5 SHA-256: 3674da3f783a3bff649beb10ff3e808845dec2211f8781c9e29318ad704c3459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a likely phishing or malware distribution scheme. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://halmar.info/userfiles/file/96308485592.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160923d312781c---8900797974.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739bb5c35f9---12925339904.pdf
    • https://amatnieks.com/pictures/image/9114227384.pdf
    • http://savalis.ru/userfiles/file/guvafeduvuveti.pdf
    • http://agcslohian.com/userfiles/file/8473462847.pdf
    • http://shopexpert.com/app/webroot/files/userfiles/files/jazawaragev.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071897f7aff6---10409795596.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0b9215c21178d2ffb16c81d7499cb9fa/vajobavuzejexirese.pdf
    • http://www.ecvbrass.ch/user/web/file/lesijaxisopo.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/48466183744.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6deb98cbef3c45d0f7b202b929a6c438/3314945512.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e8529e35---lefisarop.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/154e2dc92913a443f5f1c6f5dfc49a81/sosepufemis.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f92d5abdf---88472582571.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/luxaradibokipu.pdf
    • http://samtekelektrik.com/files/vagipevifekajopopu.pdf
    • https://poolpoint.be/uploads/file/zukivowitanamaparijo.pdf
    • http://www.chatanakonci.cz/userfiles/file/51852788921.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/dc6db61672fb9cb5a70a0dc0187f2702/liravowonozodubegumolofe.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/80a0abe88a3e5aa214f3fdc4b05179da/69097821389.pdf
    • http://kartywspomnien.pl/uploads/assets/file/314229417.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/49a822d909fad041b57a4ebab541fbd3/84474678921.pdf
    • http://ankaser.com/userfiles/file/915231276.pdf
    • https://fanaf.com/article_ressources/file/jovirozivikorog.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/s5kst47nnedjcbbalb7rk4jipu/85558235742.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=names+of+triangle+shapes
    • 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_off0000fb21.bin
2eb3cd787991a77b98de753d2eb9293f2a548528ea0e6422b5ec23120f1bb1cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10780 bytes
font_01_sfnt_off000113b5.bin
479e414a8ff288cba6dc6a1513a648be2e05380f10b19910c28406e9255c7409
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 17444 bytes
font_02_sfnt_off0001418f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1418F 16792 bytes
font_03_sfnt_off000159a0.bin
dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x159A0 16224 bytes