Malicious PDF — malware analysis report

Static analysis result for SHA-256 991d7edb96feb73a…

MALICIOUS

PDF

93.2 KB Created: 2021-06-28 15:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2745160e096f118fb5683d1ceeeaf619 SHA-1: ce336bf214430a5facd2d841169fe3857747dafa SHA-256: 991d7edb96feb73ae63fb931c7860f4d05181e4512551507824d2f4790d25a63
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097728d0af57---74330097504.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081e39542c5b---kerejag.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c3245f702---tanobes.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/689df4efee7630fec3dac66d6dbe7343/91142005307.pdf
    • http://w-f-l.de/user_img/file/rudubumaxuz.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/923ac6d29ef8c4c7933a906a9d7d7a4b/muxefogog.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/291581f48d8934d8fded650a89d278a4/57709305639.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5ba05rp07iuvds2fi89i1eidel/banesub.pdf
    • https://actor-conseil.com/files/file/68079168315.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7076f7bf---pesimorexerupizomitam.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/308cca6d66a0c0003b440b733017511b/17715459449.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/91dc804a65500ed27bad36b94aeb3d78/rabafisejov.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t0mesekgd0i2noq3pc6q6d0ovb/zofidezamisifarawobeze.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb61e548de6---legonawibeleku.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6f30ab7c---gokolufuvuvipamisa.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6461edac5---6444827336.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/amrd2lnbnfdm7fv46sg7curh8i/vipugevoxerefaf.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8580cec5---sopenexoroxakabaperajumum.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb74e2c19c---regenepojezuganilo.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/87a8e4b46d9d24ce304bc055e11d28fc/88018888973.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094939de0054---58507414894.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8a71ababb---7900555058.pdf
    • http://bscartridge.com/pic/bamowuv.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b94d6dd5---tifedidefapipibuxujeboba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cinematography+for+directors+jacqueline+b+frost+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed09.bin
d7de0497ed9f3cf97f935132f6a1b8cf75fdfd3a9b4c1c8a8c16fff1f5e25f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 11728 bytes
font_01_sfnt_off00010818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 16792 bytes
font_02_sfnt_off00012029.bin
780017138479f55a3882bd0583f2519ec6a0c014fcb88acb773604e03445b24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 17400 bytes
font_03_sfnt_off000139b1.bin
d54cdaaf87585bb98933e5140fccb63dbf8397b8915f202c5063ee836ae1af76
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B1 17608 bytes