Malicious PDF — malware analysis report

Static analysis result for SHA-256 9879c816bd1c0725…

MALICIOUS

PDF

86.0 KB Created: 2021-09-24 08:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89aa1ff2299f0395c5663d7685a0df9d SHA-1: 6b9f2d4a64b24cb0f2d14a569db0d9bc3203883d SHA-256: 9879c816bd1c07256b680e67bc13a60c03e864662cf8dcb3a5c0b21ad5cdabf9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://producedepot.us/userfiles/files/kidavanerifoxatadixikef.pdf In PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/48006831230.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/orr2u57h1jldv6elps8ospm5u7/fezavejunarujape.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/66073098284.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/78052875068.pdfIn PDF document text
    • https://hoongnau.com/upload/files/99976850738.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/87318380370.pdfIn PDF document text
    • http://ingore.cn/upload/files/79241802281.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecec06a649---zaguvemukizopuwiwax.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/luxaniwetivixotubu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/nelazodupefirigugo.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/86053234444.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148de427f2f4---74066335573.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/14183663376.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/37371865751.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/27653295914.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/sevabalena.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/24294658192.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/34583122612.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/45746772661.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/78777111015.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/nobowebile.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/90936272111.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613146c5a6d50---31713510003.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16142eaf446f7f---tubogedeleriseka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+jazz+theory+book+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_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 10684 bytes
SHA-256: 5aaa82f996e326649aa8f04296bdfeb2faf5cfb784dfbe418d32a317fe14fb83
font_01_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 18008 bytes
SHA-256: 3a32895d73d176fa9b90d768341ac3051be930157e092d770e833f9cb83e2c67
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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