Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af45361039c224f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 03:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 690445e407eea4ce60cc983f7fde2621 SHA-1: 381446fb4931f956b489703d473c67290caaf63f SHA-256: 0af45361039c224fa65051992b0731309bb877265a8f5afb6a5cf0c8a8e8cfd4
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://forumhrdbekasi.com/webroot/userfiles/files/52544236627.pdf
    • http://directartdeal.com/uploaded_files/userfiles/files/14110117144.pdf
    • http://testplanet.nl/uploads/files/vipebob.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/94092d8e892bec1e039dc0639566a730/26408042664.pdf
    • https://sinarlangit1.com/contents/files/65199764569.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18736823234.pdf
    • https://krzczonowice.pl/gfx/file/sizomanivokusajekalapub.pdf
    • http://bivalyracing.hu/files/file/pabiguzibiwi.pdf
    • https://atkarisuli.hu/userfiles/file/tenusodusufolepup.pdf
    • https://speedwayinfo.hu/uploads/file/25306229323.pdf
    • http://dkstores.gr/userfiles/file/jiwixa.pdf
    • http://iranjobex.com/cache/fck_files/file/53427393828.pdf
    • http://wsm.hk/images/files/91498513967.pdf
    • https://hrmconsulting.biz/upload/files/58475074333.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d6033649356f46ce69382e1f43005bb5/babisemaruluwazuwobalaba.pdf
    • http://studionegro.net/userfiles/files/41190366508.pdf
    • https://indiansabroad.uk/userfiles/file/juzepowasafuwujedorufifel.pdf
    • http://celesteandtorsten.wedding/images/file/futopamanijogufuzowex.pdf
    • http://eros-arena.de/eros/userfiles/file/97950378457.pdf
    • https://hotelite.in/userfiles/file/22397846829.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134869995168---jovajugexikopivu.pdf
    • https://ceylinpin.com/calisma2/files/uploads/8275004708.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+mobile+tricks
    • 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_off0000d840.bin
3200d55b67560dae107ced6d50805158401a81d3ecbdf26c4b3f189cd93cf028
pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 16820 bytes
font_01_sfnt_off0001034d.bin
c9a3ab433f18915b89d34ce2c92fb45f80b2776b0d0fd278b3a31afdbfc343fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 10584 bytes
font_02_sfnt_off00011b72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 16792 bytes