Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ee88cbdd737f97…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 04:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19219850359aaa6d6fc57950a95611c3 SHA-1: 31115f1b7879a37d8e0fdfb7ee64e2496536073c SHA-256: 34ee88cbdd737f97e582e2c8d55547e9bee96978461520dc6f3477d7e2fbca94
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, utilizing compromised CMS uploads and disposable hosting to host PDF files. These PDFs likely serve as lures, redirecting users through a series of links to ultimately deliver a malicious payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/79c8a657473ed5b128d546748134d0d0/74337696056.pdf In PDF document text
    • https://vibanghanoi.com/uploads/files/fuwagizexorubunumif.pdfIn PDF document text
    • http://warehousetraining.ie/images/86098868766.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608664d31e27c---95280793136.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gobifiwifakatep.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/23257471682.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/58325095.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/59116046939.pdfIn PDF document text
    • http://nenorm.com/files/files/3248525549.pdfIn PDF document text
    • https://majubesar.info/contents//files/nadaditojimasediburaxogep.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/rofonada.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/36745202545.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a6d269333d2---vabuwagorarim.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/57213895461.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/35563172419.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/nizelezenevugi.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/fekafadusazijakisudaj.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/popenav.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/68280783072.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9caba9b9f---16089756737.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/76961251181.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c9be417ffd8e8fa3ae765ed7a4c1da9e/luwevumuzupabufawafo.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/96679284597.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1316e7d6ea---88424215475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wind+turbine+generator+types+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC413 10976 bytes
SHA-256: 070d03f11eb0b3aff677d46a1db2440ede4bc53220d2017f1f3662dfd78b997c
font_01_sfnt_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 17196 bytes
SHA-256: fd6078d1c506fb02182ba6bbafd17675e779c4814ea8c05073b4757081516ead

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