Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0241374901bf5b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 04:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddb735a15bcd64fd0300f6a6f063cfea SHA-1: 547ab5c4ed180252fbce634486ed13f77b47dfa2 SHA-256: 8a0241374901bf5b1d15a7960930388c2eb12d531d42116be2b4fe86c37f3141
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised websites, with one URL specifically hosted on a compromised WordPress upload directory. ClamAV also detected it as Pdf.Phishing.Trojan. The ML classifier strongly flagged it as malicious. The presence of numerous links suggests an attempt to direct users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ccaquebec.com/userupload/files/85393629046.pdf In PDF document text
    • https://ms02bet.net/contents/files/4272595338.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/dejuvetumu.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/xuvebabekakikojew.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/gagemigere.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fabc3ae9c---rorekilevawepobulomidi.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/pilebupefaloxo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/25738275929.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/togufojefib.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/43449514756.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/gaximumogage.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/79719334627.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109080548199914.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf5f0bcb9---xusiziledupikaduxinum.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/tonadejarimemetijaniduzaz.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pnheatf56eoft4fduiq8qet5b9/muzusifetinoj.pdfIn PDF document text
    • http://infosierra.es/images/editor/sipofopewididukix.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a34d7ac---riletulifegigetewug.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/gimejupeb.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/tajimuveruzapa.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/fujawebigelevobinile.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/2053986815.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/suferinevolif.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29fb17bfc---dosirebaxopezebefid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=picsart+pc+windows+8.1PDF 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_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 10740 bytes
SHA-256: 2cb2654fe27970d6024d068356439334684e72239cda78a8c3a7b7dc3b3bd5c8
font_01_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 19232 bytes
SHA-256: 34f4ef40c972645fe4a7dc5421cde4403148a5ea72feae1ec52ea1e65a174de5
font_02_sfnt_off000135ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1