Malicious PDF — malware analysis report

Static analysis result for SHA-256 32832e6bbe139e3f…

MALICIOUS

PDF

83.3 KB Created: 2021-08-02 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90bb530622ae4cef4d2a7994b6a11035 SHA-1: 2e01553160abf15dba468dccecfa32337dc48505 SHA-256: 32832e6bbe139e3ff4d8a312a14222eb26024e138e07b8234020630aabaddd94
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely used to redirect users to phishing pages or download further malware, aligning with the characteristics of a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74af7ad22---gamuwati.pdf
    • http://atek-ent.com/upload/file/45931839407.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/sr4cligmj83sc12g1c1vkipgs7/93653766264.pdf
    • https://mtmnetwork.net/uploadEditor/files/kolosutitebugenejuki.pdf
    • https://investincarpathians.eu/app/webroot/media/files/34940323040.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d748510d5---51653277710.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0fhbaj8q9o3qo1e3ekmm526ls1/govedogewegonixeva.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/18ilm60cdm77fcto00sksvrfr2/nodevuxadam.pdf
    • http://voxel-avocats.fr/uploads/file/72706229562.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/137e755ce5809e7312ff6d0127dc7e04/zazavazaninoduzozoju.pdf
    • http://agiusfuneraldirectors.com/files/file/larikapimoxosizef.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d631b090f3---lepinikafabunolikutazax.pdf
    • https://sentinels.ro/userfiles/file/kameka.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608986311b154---fuzetevigejewerebozu.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/pabanikujudas.pdf
    • http://a-b-i-s.net/layout/bilder/file/sikaruwoxiritopinikawi.pdf
    • https://avigailpekelman.com/sites/default/files/file/sofepodujudusine.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c2b7069---bemufekudevosek.pdf
    • http://brandnewgoods.net/userfiles/file/mubixagijola.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/98967262282.pdf
    • http://studiosiriosrl.it/userfiles/files/2283952507.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b77546579bc---73315049279.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80762c83ad---kutigubatikowejozavimibaj.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/vidunakapot.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/be48398fabad51a095d35b2d4e69fadc/mujokulofakujuga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cavitation+slimming+system+lw-101+instructions
    • 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_off0000e03b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 16792 bytes
font_01_sfnt_off0000f852.bin
c1683299a0a634cd999d02329cf457ba027f4dc323c67f4cca75f2bb956c25e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 11180 bytes
font_02_sfnt_off000112ab.bin
1f01ac9850ced18c70bda07c73ab8b021581569ca35ded8bec8792d8110c1ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 16576 bytes