Malicious PDF — malware analysis report

Static analysis result for SHA-256 2763a2958c11c212…

MALICIOUS

PDF

86.4 KB Created: 2021-07-10 08:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 834b17129410a83d8e3f1121ba5bc029 SHA-1: 27379d4dffa46ac951ec74312f7ddd088de4a043 SHA-256: 2763a2958c11c212cbb7f1d20739387f39b250c736c0ae4deaa1484c5df88a5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to unknown PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm structure and heuristic firings suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://noddy.nu/images/file/ralaletusejopuzunu.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/404ee8bd8d5183a7b1ee5617cf2c5fde/rusavotigudupi.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/34274473026.pdf
    • https://mimpiindahsatu.com/contents//files/lixirafegowixusojos.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e699de50b---nosexaxotiporufen.pdf
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/wobopifew.pdf
    • https://soudurelauziere.com/upload/editor/file/bizopam.pdf
    • http://elesi.eu/fichiers/files/15958944437.pdf
    • https://agenziadiviaggiocagliari.it/file/rujipuligigazedudobel.pdf
    • https://advance-pack.com/editor_upload/file/91069123965.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/mipuderuvu.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160828cdf14a0a---96559374725.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f9ad1090f9b94dfff192edb3b839640/36325086160.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/f01a92052873274d98baa1d32cdf7e9c/purezizejukapazijegik.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8576567276---92890975106.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a423cc87633---67787530054.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/grl1o6bs4cv6nqjug3023q26uc/weguxajidifogulabakokos.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48960580f5---19029790529.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/sazojubimedunudenomuzifa.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/ribakuxop.pdf
    • http://ahchala.com/img/file/zumidinigogigu.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/efmk4esr7dp1psdaaevd70ujuk/15376782982.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b0ecbbfa7dff34b929de0667087907bb/66113516014.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=parable+of+the+workers+in+the+field
    • 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_off0000ee33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
font_01_sfnt_off00010645.bin
7688488b2a99fcd6a2abd14694f6b7c70dfb25d3da6e85b2eb7b55cbb78c6583
pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 17264 bytes
font_02_sfnt_off00013382.bin
ef78fa88b0b5113f0e860618a168533e3718b139184fa49858b11ef7b6d97f97
pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 10772 bytes