Malicious PDF — malware analysis report

Static analysis result for SHA-256 2370a6b6caffd2b4…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 09:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1def57bc82785b16314419569e9152bb SHA-1: e1c9aeff2ec9587d55cb0d1be8aa4cb7a612eede SHA-256: 2370a6b6caffd2b42b9871aa56ebf710983e54e4e12724cd3c425627e25fb571
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing or malware distribution. No scripts were extracted, but the PDF structure itself is weaponized to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae29d0257---xonejujibefoturolox.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8978ac054af0f1043a8ff6ff5dd7b007/21654432421.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a7b5843b9507e6536f26dda806aec3c1/gatawepatugenureboj.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d237e1c10---73384442846.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb3f7b2cc---rinupuxulesonebi.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609460bca38ee---nenetodi.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1d17c0grfvc73su75s4evk9nnf/junawiziwaburipope.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/2c17d898953d19fd8c7c9ad565b9fb4b/tusumuk.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/92577535798.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0e6aa53576c25893f7e8cbf3745b96e4/52158243194.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33728a8619---latipabo.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8980eced3---53563271332.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/80023898172.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/39143927238.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607960c8b8bf6---vunopetim.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e6281537---54179731192.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf67f74407---xuwunotiguliravene.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755b8a05462---dipata.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078b8dfabdfa---5765500988.pdf
    • http://sam-global.ch/files/file/zepub.pdf
    • https://mszukam.pl/dat//file/xevipovulibatuka.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526e347ed6---vodulikiji.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qcf4nj0u2a3i6cmhml8pacf2r5/golatenoniwaruvet.pdf
    • https://sport-jicin.cz/dokumenty/22936204330.pdf
    • http://hanasushipickup.com/uploads/files/46635239228.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=work+experience+letter+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_off0000f1b8.bin
374356cd830bc1aecd54ca895a4ef232c07eeb8bb5c93f45e657b91f1597e4b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 17192 bytes
font_01_sfnt_off00011e15.bin
f3d6f57e1a171ccc6af255a2b3e4567c18808d37b15049f1b4b1ccf1d6a201ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 10472 bytes
font_02_sfnt_off000135f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 16792 bytes