Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d9f71fc0ac2cc2…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 04:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08e1122eafb63d30fff9d0d0e89904fc SHA-1: ad6da6aac1bef23990c8dddb11bdeaa872fb941b SHA-256: e7d9f71fc0ac2cc25c997e1afb6feb86526d7f0f3720a9143c0ae0eb03590f33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=recovery+pump+lite+manual PDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8njfb5mdiqtbiljsls88muhpa4/remadikonu.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/vugesipowisubilibilaniv.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/muxovuxukele.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/35421584866.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3156bc6f82---71389266529.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/41977998485.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161062aea66d73---jubozepedadapadidazereza.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/lojulisozamolezafu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c4d40a57b1d1e00b86b61cb2d16b86ea/86447672657.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/73855102315.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/koneko.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/wowuvuwudusozesuwevelawu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a55218c36---56240071835.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/gataw.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/ramixetamofaziliteful.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/nodolazewof.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/20193397167.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/55719208767.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c9b1f281---dalolimobivopitinaborolip.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d63a51b23---12340748076.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/1155f099399e0f82c8641da177057acf/98493161718.pdfIn PDF document text
    • http://lulanjina.net/upload/files/pixoxa.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c888912c29---71307878026.pdfIn PDF document text
    • 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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 10692 bytes
SHA-256: 1246009ec769ac51fd939ca126800de621aa1913beaa9c5de6c77a07b85eb51c
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 18704 bytes
SHA-256: 1bbccee2afcbc2d6fc9931c7c09b71357698e262ad2ae67c847ffeb33e192bf2

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