Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6e88cc7e732422…

MALICIOUS

PDF

89.4 KB Created: 2021-07-19 21:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1107a235d0515eed0a6a3c55568acf23 SHA-1: 153d4b48fd32a92fff5e9ad561267b5e5cc8f45c SHA-256: 2a6e88cc7e7324225b904b4107c9691e29e903d3e9954576d1c3fd85ee1eb2f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://motivationandmomentum.net/ci/userfiles/files/veketesomusidolimam.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rq61cu56otoka85rge615i3sg2/93042046344.pdf
    • http://toanthinh.vn/webroot/img/files/rularaxunaru.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/palorowizogabutekokim.pdf
    • https://semineebrasov.ro/printuri-fi/files/josikilogigutamega.pdf
    • http://frezerovka.by/images/fxeditor/file/89244781506.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b7036204e0f432fdb2c4cb55ced9188/fevexivajurexikip.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09579adf9d---puvunigi.pdf
    • http://www.deopendeur.org/imgUser/file/wivonozezetikuzenisiw.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3852ae16f---naxodawixegag.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0tdhkp8jh3c9l9c4a4utv1r251/89785605720.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d503efa90---10663137626.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1cf821050---xeparajilejivu.pdf
    • http://adabaskimerkezi.com/upload/file/gifinobudepokum.pdf
    • https://champion-osk.pl/userfiles/file/jaduv.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8136e5f2---jasikeniz.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16083c38d01519---pevisawademokomuwamanemes.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5fvclvor0s492n1cqrkrignkp5/xixun.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b79b624801a8468a0dc0a8040b837435/89119239906.pdf
    • https://mygrind.ie/userfiles/file/bavag.pdf
    • https://fontaine-eva.fr/userfiles/files/fiwajuxemutuzava.pdf
    • http://ahchala.com/img/file/sibisobebalomebuku.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/23815125347.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7da8dfec---dafowukuzikitenofe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tell+me+about+your+weakness+in+interview
    • 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_off0000f963.bin
223a6bf5dc37dc8e37417a114cc355699e0be97d1e0e60dfa45bbc6fa0af69fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 10828 bytes
font_01_sfnt_off00011273.bin
157f39a1945e797ac7ba2f61cea52c6cf1612a06e5d1679d3b0673c2d1328196
pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 17488 bytes
font_02_sfnt_off00014006.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14006 16792 bytes