Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede3c5a378bf8757…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 02:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbced1e46cfd9dc144e7a491bb2bbb21 SHA-1: 277bf58a7da98c457a7fd7e0f0b7b1959d661409 SHA-256: ede3c5a378bf8757c1a633d9a7fcfa55359bf4e99346c55e1b11f38aa4711f9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=firefox+beta+android+download PDF link annotation
    • http://sakesushilakehavasu.com/uploads/files/lavez.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/majivemezojamosipopanat.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/setikafiv.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/10859505235.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/73939951474.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/vivudu.pdfIn PDF document text
    • https://wrd13.com/force/file/78481893355.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/76447513252.pdfIn PDF document text
    • http://favourtec.com/attachment/file/47142693655.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/tutegalirerev.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/66508084805.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/79706213647.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3b504392---91257075531.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/guwel.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f7f00a69f04bfe70e0d8ce726a74e2fd/pubijimusavowozuf.pdfIn PDF document text
    • http://hiniceshine.com/upload/fofak.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210907_173149.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/32237690573.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/43773682852.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/72277268566.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/mukulotivomivevidivenixed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d1baccae---68534385375.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091602501073499.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_off0000c092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 10484 bytes
SHA-256: 03e01c95b4a2727789adc71857c91a53355c8c555984b2be023f6b44966f4766
font_02_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 17232 bytes
SHA-256: c351ee85bf2600cf69573e2b72bd570c07c8897fea817978a245b7232c8434b6