Malicious PDF — malware analysis report

Static analysis result for SHA-256 a213346e9b3736f0…

MALICIOUS

PDF

90.0 KB Created: 2021-06-28 21:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d52048f9b7c3f381c717c52e3476d8ab SHA-1: 8d393037746eeb405114f5e9033f42f777bf0301 SHA-256: a213346e9b3736f05c13531c05e350874184d8bc89c731daa81a1845f4b88cc2
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 embedded URLs that point to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or further stages of an attack. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8h3p47276fnrip3mq1bdvn6v67/90720195763.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c970584c13e022e5b54503120d078e98/wujojujoxixotugor.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/868e4d74f91e2d20946738f79a0430ef/5047129258.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sqve4bvf1jrmg5k15aherjrr74/fafatugevugugifewudefi.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9662088eab---14074907584.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89403757cde182f9853539d2617484a1/51778583073.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/076d3ivd6gi92cins515o1c84d/97183128075.pdf
    • https://alatheir.com/atheirwsfiles/file/gixitebiwopavavola.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0e2d20ac0fb9aa5b78d68c23a64ff2af/46315244157.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mghh6t7eme54tk7o3i7adt2tq7/kozugonijugafokiwemef.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/78779559418.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb57e56474---65512479707.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2be12535---87127221489.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092e82da7f03---68799301011.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaad77f007ac5593d66915b8a4d79d95/divupedimukerufogegog.pdf
    • http://leoclubmarsala.it/userfiles/files/68933660987.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607548bbdd71f---rudevurekor.pdf
    • https://bitree.ru/ckfinder/userfiles/files/tonuxiliga.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8255721ba---21682345726.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607710553322b---30582479160.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+suck+a+penis+correctly
    • 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_off0000e887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 16792 bytes
font_01_sfnt_off00010099.bin
68b3d6fb43bb6c4a1032b27de81fc3cf5a7dcf79cbbb8d88697cf5d7d9502551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 16892 bytes
font_02_sfnt_off00012c31.bin
744ca0ed3f7c1f09a85a8d2b0a22a4931870a29abd53371dbeee55f0ec50bd88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 10752 bytes
font_03_sfnt_off00014520.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14520 16092 bytes

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