Malicious PDF — malware analysis report

Static analysis result for SHA-256 f485c23fa7018524…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 17:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9c1fb31d288dfc1ea4aa10297b91028 SHA-1: 3a141a0bed71228bad46a8e2d40d6bd52c744cb3 SHA-256: f485c23fa701852465ba71fce898822907ec4d9ce8905d53ea888e41037976df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised websites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL patterns suggest it's designed to lure users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=mcmurry+organic+chemistry+8th+edition+solutions+manual+pdf PDF link annotation
    • https://eminenceconstruction.ca/viking1/uploads/files/ligon.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/kixax.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136111884962---kavekinosapakexapezarosig.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/povapifejalowed.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/9376755697.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9325dff3cc3df04eb55bbb67d4bb7668/xanarusizal.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/69109847073.pdfIn PDF document text
    • https://korankertas.com/contents/files/vigosabuzapodakeg.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/remoduwew.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef29964af1---90780935824.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/53471646012.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/nikudejojawoju.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/marozaw.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/56420155554.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/pifejumomunat.pdfIn PDF document text
    • http://sptcrane.cn/d/files/98736712385.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/24706892504.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/74449550617.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/44053859026.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/sosedelo.pdfIn PDF document text
    • http://linker-apps.com/files/rulofozazamonokamijopo.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_off0000afa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 11484 bytes
SHA-256: f5cd7c32ce628af2f8a431b988262bc68c967f2c6e9ef324239cf48af2e7ac38
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 14956 bytes
SHA-256: 7aa23000a93a162b0bae765a69b169041817f2d447142e63d1ffa107599562d4
font_02_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1