Malicious PDF — malware analysis report

Static analysis result for SHA-256 19abb652909f8c78…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 20:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1241460c66b9aa0eb4f57f5ee5c36bb1 SHA-1: abe1d5adfeaa6e4cfbc7660c594dac5de9785678 SHA-256: 19abb652909f8c78072842d6bacf70dcca3401204ba95d4bbb54b02f97efb24d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://taevlingar.se/images/pages/file/46501963447.pdf
    • https://allcreaturesinc.com/files/files/vufafud.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e61d5f6ee543baced4760fea1ae3041c/61980078503.pdf
    • http://intertexmedical.com/userfiles/files/25456315077.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ej5dgi7iael6prda2jsglsllp4/miguwajenuledotitijof.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a694e73cb96---66214236558.pdf
    • http://posekatzahradu.cz/files/file/82714893274.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdf659d61---3721442988.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a022350d4fb---bazisedolilazevoposof.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/regamevebazobofirigawu.pdf
    • http://lhs1965.com/clients/880801/File/60666148163.pdf
    • http://clarksville.net/wysiwygfiles/file/sevekovi.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/972pvr97qm2ub7e2agdj3ppiq7/fojozixofimob.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16082264f4b43c---puzaz.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ba036a6015a---tepejubube.pdf
    • http://lateonsettay-sachs.org/userfiles/file/5472546065.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c719c22e5a3d075b3b8a341132a3fc84/83118435711.pdf
    • http://sisparts.pl/zdjecia/fck/file/fuwiritogoxosim.pdf
    • http://mtsskzy.com/userfiles/file/19443154917.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/50761e75f8bbe7de60131145a595b28b/23388417951.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/48vft4h5anomjf4nrq4f0d8vc4/bonajafukoxirafinimabip.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160803a1bde65b---40342545592.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8a4b7183430a3a0b9a60768b4b4657d2/85650663337.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2d75543e---rukalujigoxawixexufakewo.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76b6ad8ccb---90172272905.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chocolate+lava+cake+for+one
    • 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_off0000efa4.bin
dc7f24a0b7ff4687e1151e4c1feb3f013cf86bf1c526cc3e4177b2a06ca25a13
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 10360 bytes
font_01_sfnt_off00010716.bin
cd4ebc3d61484a89fabb2fb28bba4aa3baec04d251f643303f43d2724dc94fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 17792 bytes
font_02_sfnt_off000135c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 16792 bytes