Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bf36729467d48e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-09 09:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 884b78de605f9315f14b6573879a1152 SHA-1: a6edf06fde73024c15bb21e72a8eca7335f5eeca SHA-256: 08bf36729467d48ec50bf599c9103014a24c1c3fd9e83e82e34032593b351886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://angelsforwarriors.org/userfiles/files/fekudor.pdf In PDF document text
    • http://canadanur.com/resimler/files/51897493711.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613965a0d1ed3---veparafakesemeti.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/xosusajivekodekepako.pdfIn PDF document text
    • http://cocoal.com/uploads/file/zupagavawimelos.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/66510943680.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/palofowiboluzesi.pdfIn PDF document text
    • https://jetaime-shop.com/files/zidodarapapafijixef.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/82730262193.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161316b891bb5b---gepemegosa.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/73053425699.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/gijusakumexabifu.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/gexoba.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/41693202331.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/labawarav.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090516450173499.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/mifuwutebenijabixik.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/71920649922.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/64979266430.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/fituferam.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/sulebikavow.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/18798128716.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/55109058244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=military+strategy+games+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 17236 bytes
SHA-256: 34ea775c5104173a727b11455bee3972858c5bf42694b7751095bd40d18decdc
font_02_sfnt_off000133bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 10700 bytes
SHA-256: df7eea527c3a1cfcb9dd3717db48deb90075866219f4ba4b33dd68b159d6239c