Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c76abe192268cd…

MALICIOUS

PDF

93.0 KB Created: 2021-06-25 23:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c34ad627091c4df725c9df2058878ad9 SHA-1: 64dbfcd4d0386e73176dd79a0639666c000f698c SHA-256: c3c76abe192268cd2edf9577ad97f0d50a5caead4ebd6fd108da54f7bf57a8a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it with high confidence. Multiple heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, though some are marked benign, are part of a larger pattern of redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/de33b6ffb48862aacf88809788b3d005/63183930003.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36ea2f014b64e9152ffc3c1220147890/bozejamedorekevivojikowi.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3ccb9c9d2---64197506378.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/usq6k6kokv6a6f5qbq7k5iiv87/xefukejonixi.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1107270aa8a65e7125a196fbfa0609f7/dapovuwaweluvexukixurela.pdf
    • http://av-jet.ru/userfiles/file/84044218281.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfc110bf7aa62b6c8e8cbcfa5a187dc4/sisaluzurazoziron.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61947c4ca---zerevoludolazapuxabob.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/37223cf623949f576c5789b2edf989a4/53613001372.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad1542e8f---35470585347.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l6118dpq47o4gfu7m2ce93u834/vogojosiledalizubaseva.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cdrjie37mnismsj0focn23l7be/31958233882.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a78f962e6cd0494a15701eba08ec0a91/watomuxi.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a424a77514---muzimedi.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf57d38028---magakusigagiketeg.pdf
    • http://imailbox.nl/images/uploadedimages/file/gaverorozawepilepif.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a118882afdc---54044809500.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d03bb7d2e2b23f7739883bcd4dcc61dc/90895021598.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/fodozav.pdf
    • http://uralinteh.com/uploads/files/85500696674.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/viregelovavozu.pdf
    • https://okazdedziecko.pl/_files/Media/file/5938422663.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085906495aca---kerusoluxowu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=je+maintiendrai+meaning
    • 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_off0000f311.bin
5c0a5737c5c8f656e6231db1e98755dca05abb8d188d5a93c9a2b01e2a786991
pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 10248 bytes
font_01_sfnt_off000109d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 16792 bytes
font_02_sfnt_off000121e2.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 16252 bytes
font_03_sfnt_off000137be.bin
5649393f3de28ca8462f3f1d09833fa6133d74f4640de5a566f5de9def1db11c
pdf-font-stream PDF embedded font (sfnt) at offset 0x137BE 17276 bytes