Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d318a3c40ff26f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 09:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae699774266c4036e769fbdb04f699fe SHA-1: a0b3d5f3bdce31d2b4d2a10e0dc0010ec5d8a0f6 SHA-256: 19d318a3c40ff26f4b3beadd4ae7458662aa3ff1f1437cdf89feeac08d525e91
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to host malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/7130e21d9c2baaa82a4a2789a1d23dc1/79430174886.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/de46f39c839c24644580f3a0a6b2c8a9/97852036302.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6605bbf1cc---52814561175.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9lv786p6lds2pnmb0ifjj0pctk/38855045033.pdf
    • https://kaptenhoki.info/contents//files/vekatibetuwimowekila.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3fe2ac7efbc772216b2eedc80e7e9bb7/xujabevinonasitagemupuw.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/75630240041.pdf
    • https://bawwabatrizq.com/userfiles/file/4912583851.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/60091366466.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/kixugefemonovolarem.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210718_A8756547FEAA3D55.pdf
    • http://firegallery.ru/img/upload/92753933125.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d505d421335---71243129750.pdf
    • https://istihdamhaberleri.com/upload/ckfinder/files/37425501078.pdf
    • https://gotoko.com/cmsv2/upload/files/riloxajewo.pdf
    • http://driver-jazda.pl/upload/file/15876479648.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/f35e443255e4947d93a42ead6be2b467/vinepujowugizisomejewor.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5fb69a5117507abc27ef29a968186ea1/10559768000.pdf
    • http://studioingegneramato.com/userfiles/files/4141495621.pdf
    • http://scard.vn/app/webroot/uploads/files/gezebugadunewasel.pdf
    • http://fine-cottage.ru/userfiles/files/wojisexu.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885e345b8af---46379611754.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+a+quiet+place+part+2+123movies
    • 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_off0000bcb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB4 16792 bytes
font_01_sfnt_off0000d4cb.bin
5e5afdc24d262f138facd1ac8a6fe12a1d194cee3a5eadca2055bbff7bab2f2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 11184 bytes
font_02_sfnt_off0000ef1e.bin
ed7e03298a3da8b127a7b0a2e8ed4b600014757cb0b115eca520a2841c3947cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 19596 bytes