Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6c046eb11c2a9b…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 00:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ede812da578f7a4f622c29a67177a6a SHA-1: 3655740d8640f2ae362129e820df2583f4af4e4c SHA-256: af6c046eb11c2a9bba63f72d463f25c58f81b75d5f7087ee82359d54505e45a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms, many hosted on disposable domains or compromised WordPress sites, indicating a redirection scheme. 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 embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=redmi+note+9+rom PDF link annotation
    • http://alacarte-husum.de/userfiles/file/luwenatidumalebuvin.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vikenozunovozazokotibeluz.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/lifaniwimilegunebiwumet.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904173551161397.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/bodusod.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fe73eb9c995211cfe830ae0ecb0f29da/64542097464.pdfIn PDF document text
    • http://imoroz.by/upload/file/47151693380.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/15303133320.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/jalavuvizofikalaweta.pdfIn PDF document text
    • http://change4best.ru/upload/file/93042689309.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/61762785871.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/zojisamekazikikivosakaxok.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/jirunegosu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sivuretodusesusebusugod.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff925c610---84516670647.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/xedutu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5a7237e9ffcff506225b48ddb2bc2e39/1299271756.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xovupekusa.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/97224713496.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/42898668610.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_off0000ab13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB13 15584 bytes
SHA-256: 284abcc2ce01fae2bbbe5c001e391204b1391bbc1213b35abbbcb156fbc8675b
font_01_sfnt_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 10248 bytes
SHA-256: ffe35a32c81ee13d6b4a74ae65795c25e8ef340315389f14acc8b1337b36662f
font_02_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1