Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1975b547fda583…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 13:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c796c504a32069effe720827f5a9a122 SHA-1: 23f916f210410ca4311825ddbe4d5d586d6c464a SHA-256: 9a1975b547fda58385aa7232d4ea30e65e6f7d0ad3ab7cbd768117248ae67da2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards a malicious link attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://urbanposthotel.com/admin/ckfinder/userfiles/files/48770560045.pdf
    • http://panziofabian.hu/fck_kepek/patobakisavunuzebiz.pdf
    • http://freestyler.cz/img/file/77203122510.pdf
    • http://soundspace.eu/Upload/file/41835061220.pdf
    • https://arerp.kr/data/file///96147486537.pdf
    • http://woykoff.hu/upload/file/32926493095.pdf
    • http://apexibd.com/uploads/fck_uploads/file/komurowepujemupa.pdf
    • https://producedepot.us/userfiles/files/zofovavu.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/18482091023.pdf
    • http://actlogistic.vn/upload/editor/files/bekafotazixodepa.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d1e770d312765095d5e2719ca7e57868/60404721840.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/4351510452.pdf
    • https://didacostruzioni.it/userfiles/file/85905271481.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b844ce03a---kopuxoxetili.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nagekoniwefufukipom.pdf
    • https://suncables.co/images/file/nujixedufokegujijefoku.pdf
    • http://2sisaccount.com/userfiles/files/bixoreduriwur.pdf
    • http://lsphc.com/userfiles/file///39856145004.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/771ca364cc0bc3e4aa7b9f63c8d21e22/pominopiwejupexogun.pdf
    • http://stoka-saarlouis.de/userfiles/file/suwava.pdf
    • http://zaintik.org/files/galeria/files/xubabelevabixemojikimu.pdf
    • http://medi-sen.com/files/files/pufupisotujojuximuxuxole.pdf
    • http://scandirent-new.ru/uploads/assets/file/17769378748.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=all+of+me+chords+no+capo
    • https://b2cdemo.tickets.com/content/files/80430335775.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b3.bin
5405dee2c34f7b414d939637cc17b29f9ddd0644dc5ea2973a00ed55974316df
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 10676 bytes
font_01_sfnt_off0000caf7.bin
bd3f35cdfbb087192eb32af96b92c91abe5540035835cc8d756c34c27b7d96d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 16776 bytes
font_02_sfnt_off0000f655.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 16792 bytes