Malicious PDF — malware analysis report

Static analysis result for SHA-256 674d9119442c5eba…

MALICIOUS

PDF

138.5 KB Created: 2021-08-18 22:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac8328056591bde69a92cc0b841ec25d SHA-1: a5574ae172121ca8e14f8b7c2f30b6d42cc08cb2 SHA-256: 674d9119442c5eba637c2c958d82127a7ad026ed654b779eb929d7e71d735391
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 pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, aligning with the Spearphishing Attachment technique. The presence of multiple external URIs and the nature of the links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd04832e0e---94669712667.pdf In PDF document text
    • https://topupdana.com/contents//files/gudisofakipate.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b19df069---gunugowanorawozumoguxalul.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/10439505734.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/komumifaw.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/67f5455aa4b5a456cfd480f7c0b58a99/6545583731.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e7f721b06---jugudaxikapujewemaxu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9865d7a222---85919523738.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609222f45f900---jabukujurubutuva.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ae089f965083f0e6ecfdc11612a0ed3/wogubodurokununidi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rhdv2vtm1uilenth02c2r23q7n/33797913940.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/vapafamufuzoruxozepagide.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1nc8v71gsaf4p3pjoamq9sr8qg/68849533107.pdfIn PDF document text
    • https://baptistfriends.org/media/sigamixal.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210813231814.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3e5760cb---86332643671.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/73961299129.pdfIn PDF document text
    • http://toonesk.com/upload/kafibojuxiwikonagarupo.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/79ace48cd5ddb63fbb4e77acdc681b30/temotafipaveseluxalunas.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a955de579---wigudusal.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/87982658595.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/85570572281.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/dikajif.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d650b487a7b---zaxunefoxitodiguwed.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/50710333003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=arifureta+light+novel+pdf+pt+brPDF 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/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_off0001af60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C772 17956 bytes
SHA-256: 038870f248117406c1a65b6d0d804c3a54bdd372c2c24780f97d31c8f3c43f49
font_02_sfnt_off0001f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5CA 2900 bytes
SHA-256: 77b81b23f2930df4369f9d83ecd870e412c32ab38b17a57e061a96d89fdf7127
font_03_sfnt_off000201f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201F2 10896 bytes
SHA-256: 8dc995e604935cb556c7ba0d6d3957d4cad2053d4821065019a68f8a44bc136e

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