Malicious PDF — malware analysis report

Static analysis result for SHA-256 485c542a319499df…

MALICIOUS

PDF

74.6 KB Created: 2021-07-17 07:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5b6d05a51566fe774dd277374d43fb6 SHA-1: 30f292ad4382c6fad2fc6dd17ec07e15e51d0b87 SHA-256: 485c542a319499dfffc76b4778b93de420fa8855f0f83310160424630ed4f21f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the nature of the link farm and the PDF format itself implies potential exploitation for client execution, possibly via embedded JavaScript or other document exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7479867ff6473d1ffa6c3f202bb96180/90953923350.pdf
    • http://anhbanglaw.com/userfiles/file/26982110930.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4bfa438c---44821834147.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7fe8c6b0---24854773497.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9be45c602570ec828b0dfaa4ad6279d6/pomagolakudivekazon.pdf
    • http://akicgiyim.com/userfiles/file/64797418712.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/56357620853.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2a4697aa---nivimakujotedasujur.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/maberedavuwaduwemidiwev.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d57b6a9fe9374f9af2a4441f9da722e3/boludowanogimisa.pdf
    • http://automotiveenergy.cz/userfiles/file/rinelabevaziniropoka.pdf
    • http://www.monts.sk/upload_images/file/sujikewekajujonadobo.pdf
    • http://omg.su/upload/File/feludafejeni.pdf
    • http://gorisum.net/fckeditor/upload_file/file/33091650296.pdf
    • https://norservis.com/files/files/70583342727.pdf
    • http://shqinze.net/admin/upimg/file///23567728712.pdf
    • http://wecans.net/_UploadFile/Images/file/nekabu.pdf
    • http://indemo.pl/Image/files/61878964146.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/aio2e3mh50k3adtlsfhe4o0k03/12380644468.pdf
    • https://puppometalli.eu/file/zebemasufabizo.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/eov8euqh709gpom8qskumibq53/91664077302.pdf
    • http://npas.ru/pic/file/65672036355.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=two+digit+minus+one+digit+subtraction
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c12d.bin
5b8dbfbd40acee67cf7b5ab717c3e48b23de8b2b84082000a15f2cbeac739de6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 15844 bytes
font_01_sfnt_off0000ea1a.bin
d98216c746fa84c09102585f4418bc49f727dd84482922dc35d27df53c0a04c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 10956 bytes
font_02_sfnt_off00010366.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes