Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff92d03d3cbf46d0…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 05:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb77c1cf2cd61cf4fb3531c01c7d28e0 SHA-1: f3d1b0ef467a8d0052e462c75780d9cc9432157c SHA-256: ff92d03d3cbf46d0318252f73028dc2be5bea1cb924cbec97c6918ba45bfd3ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the PDF structure itself facilitates redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=paano+mag+cheat+sa+coc PDF link annotation
    • http://novelinternationalschool.com/ckfinder/userfiles/files/7643651002.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/jopoze.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bebe8a6ad---xugodugumatixin.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0b3fdfbc2a12e9276dde25035c4f63b0/fanibulixef.pdfIn PDF document text
    • https://podimercrm.com/img/files/71175724207.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/36311942512.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xebabawinu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/68335548490.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/wopuzawaturatibivadebi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hhjrbckr4mghir4dkpg34b1npe/vutekixumo.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/durazo.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/wanifizukedit.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/32655594561.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/50418134009.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/zibofomilap.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/69190314059.pdfIn PDF document text
    • https://yasacompany.com/upload/files/43422524592.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/27042040159.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/51914266571.pdfIn PDF document text
    • http://rem-proekt.com/f/file/mazupesuditoxame.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/tiwepipuxuvarenakamavemes.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/woxutojerasozap.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/fadesikavapeganapam.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/54987733460.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/tejesodidusexosawidodiju.pdfIn PDF document text
    • 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_off0000af63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF63 10440 bytes
SHA-256: bef1855147894aaaf3f89d6eae70c32fa0a53c1489f9561bf30af780864221ab
font_01_sfnt_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 15076 bytes
SHA-256: dd32f94aa0c136b72ada8b0ab97b85b8975270236c65bd202712ba658c7ac000

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