Malicious PDF — malware analysis report

Static analysis result for SHA-256 987e2813a9eb9704…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 01:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 182c706c5e2064bab65af5e70210f431 SHA-1: a6f59f64c25fb0326e3585d07e86e0e64f1a9b73 SHA-256: 987e2813a9eb9704dc236c926cc5f75094b00be06620c0fd48036eac3db2006a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jr1lbfmuna3gtapdu4p7vvrto3/85811369784.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/676f33639a6cc1820bf58198a5deb5fa/tutasa.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d195b24dbcd165783b8ec93a53761950/14596485828.pdf
    • https://searchlink.org/userfiles//file/34909733718.pdf
    • http://agataklimowska.pl/userfiles/file/wavalerexerejejaxebu.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c940f2ae041de13e6a69e71973566f2/tedetisudedetenijofonize.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/gugepiradulezunu.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ed095d3c0d0dffce2fea147d4ba8de21/67478086067.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/bobonafod.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ef0aedad---siretefana.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/e2lg35tg7vc2pnudgi1u40venf/85921731304.pdf
    • http://www.radanhorse.com/resource/files/14837833429.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b63944c3458---vadabifuzesupeburukibani.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/70ddc21ccbda1ac01368ad61220d49f3/xuvadozesikifevuxudanuku.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/wovajositarupozoxovo.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/1317e54ab480998659c6f990755878d7/74091034063.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/n0i7surn7v3rfgtbjnguvsamn6/28231777385.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/zagurelapumadirakumudubib.pdf
    • https://wecareu.net/ckfinder/userfiles/files/84823112021.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875a95f3750---16344461349.pdf
    • http://aj-logistics.com/stock/userfiles/file/lofuronapusus.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afd218ecc64---katapunexo.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/844595c4db21d65459d9c5af58802ce3/lupegedijifugebelile.pdf
    • https://hijaulumut.com/contents//files/25603234898.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=acetanilide+solubility+in+water+at+100+c
    • 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_off0000f2d9.bin
2422f0bf1a181387f487dc579ef96834c59456e753af2d698c7d7fae73cb2c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 17076 bytes
font_01_sfnt_off00011ed9.bin
c94905ec905cbae48c400ef06fe525f51bb8001523bbded08b3f91c8b2fda3cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 10960 bytes
font_02_sfnt_off00013886.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 16792 bytes