Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d2f0b8494dae90…

MALICIOUS

PDF

124.8 KB Created: 2021-07-19 05:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ba0ac0904168f24a96d7e995a15def8 SHA-1: a45d52d5be0c894168b8dd7d74371527ccdc6510 SHA-256: d8d2f0b8494dae90a7e18f6c2d42e60c76912f329a2ad93fa139104bebbdbf12
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external resources. Several heuristics indicate these links are part of a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3fddc64312c32dfb725b8b4a4eaccadd/rejoxurofirubozipu.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3m0sabfipqt0gfc2jt0scf1vd3/nejorepep.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8af85789deb74b73bdde9c9acb0dd55e/36990563551.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6fde42f94---70002061617.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/47133150246.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v897a6b1u18nmbifleqo78csj7/pizefe.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/dijaribi.pdfIn PDF document text
    • http://poorclarescork.ie/images/xaxixolarogizuril.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5a0lddk3d8e1c0c8lct4799e65/jilif.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/96474907914.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/19096310687.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/vofogarebozawawa.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/7su638trrt8j99tj2sj087a7rd/siroja.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/xorogikovotelidizaderuw.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811a87b9af---xekolagitapufolanunex.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/39993916289.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e8e8b996f3fc8384a6fd4fb676315239/dutovefo.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/e843ad6b085683f2f9c30afa9ccd6449/5317430434.pdfIn PDF document text
    • http://exosushi.com/uploads/files/mowolukanusima.pdfIn PDF document text
    • https://btegypt.comfile/76109882481.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kp0b81bdig040evvrk9dtm4q5u/tisurapiwe.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/48865951325.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b432ab43649---kofedirijuxixisadupuwor.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7deb7bf0---38349481233.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090760e89555---dazuxezogudojaruz.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814dfc8e8a9---xidetojoveluxoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=a+line+segment+that+passes+through+the+center+of+a+circle+and+has+endpoints+on+the+circlePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16780 16224 bytes
SHA-256: 7dd5fb61ea0ea1e3370d26720032e9d3de5740e898843eef2fe92164eee2597e
font_01_sfnt_off00017d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5F 11148 bytes
SHA-256: 8575c65e3cca94532f01ec432e1b5097925a3deecf31a08342e331d169ccde1f
font_02_sfnt_off00019703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001af15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF15 22088 bytes
SHA-256: 010d2d2d3731e029b49a05f96385f5b700d2a6e9b8fcd2f9eba24d72eeafb0a8

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