Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef80712b578c249…

MALICIOUS

PDF

102.8 KB Created: 2021-06-27 20:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3748567a18bf41b9d59e8de6cf187591 SHA-1: dd48b646f727ad733ae1ca63e67e0c31b6e69a17 SHA-256: 5ef80712b578c249341c99f2bc0cb21421a00a4d53da1deec37aefefd4988314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a link farm on compromised CMS upload storage and disposable hosting indicates an attempt to obscure the final destination of redirects. While no scripts were explicitly extracted, the PDF structure and link farm suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65ef683195261cf917275a1622562b11/21020528853.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086209087ecf---48663215765.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o818k2j1t9dcmh19tbqijsju9p/rasumokoloritijip.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc3b05515---21049655891.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2aus2ggm8d2klt33rjc3qmdt89/18646911996.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b563c4c7e---gatexuxemituzoriti.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/2fd31028a3a4e63c04bae63645316bb5/dalixobamos.pdf
    • http://j1medical.com/uploaded/file/41014646589.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f00229deac70531ebf88a2654b779e8b/tenowomanu.pdf
    • http://kcde.kr/userfiles/file/50267845024.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c7b901417e39a2fa8e65092aa62fd1a6/18143192450.pdf
    • https://eminencesolutions.in/resources/userfiles/file/sipalefe.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6476c6f18a988699184a02fd82bc1e34/zesujali.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2a1fc0010774142ffdbb3fee5a79778b/fibufenofemezosuzufo.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3f6567f07af91d7bc21cd3f64f1cba9d/60608257070.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0f4oafignakuuqrtftkg3uvuc2/69484081209.pdf
    • http://zabradli-znerezu.cz/userfiles/file/11094218743.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/edd1eb55a052a37ed00d99bbbc353862/43134468114.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082027ddfd4f---69878373314.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9e70d098---52426121348.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/451d9b4eb524fe6b66c4382eddf5c211/relufipinegofet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+level+does+fletchling+evolve+in+pokemon+x
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed7.bin
e83a89b4395e8a229158d9749486544ea3b9e264f2db487749d9224916ebff34
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 16732 bytes
font_01_sfnt_off000116ce.bin
75522981eafc4e8900faf08a6e954c75e0edae64b2aa5985b6b6b45852222163
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 20736 bytes
font_02_sfnt_off00014c3f.bin
7c85f4265b853e29855fa47478f4446959d16214d16c18062859c2870beb5f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3F 3692 bytes
font_03_sfnt_off00015aa9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA9 16792 bytes
font_04_sfnt_off000172c0.bin
ef650fb600666017d6fea9f41c42ea503eba57eda9f98c5cd7257027963d45b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x172C0 11220 bytes