Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b9d0692c68869c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 13:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1eb5c093fe4ab5438b56ca9237cfc84 SHA-1: 85670ab01ad549380709db470208b920a196f66c SHA-256: e1b9d0692c68869c5e8a2795bb5810269ec43461a2051ab12244e3b8a40bdf63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=when+does+mha+s5+dub+come+out PDF link annotation
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/todadozujubodidik.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ea70b230010ebdd93f4ba79a41324578/7519274677.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb02b69b4---32558832629.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b1c49fc5---pipegutatufafaga.pdfIn PDF document text
    • http://workontext.ru/media/file/94031959668.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/53001835848.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/94298340576.pdfIn PDF document text
    • https://agermag.ro/mm/file/vedapizunonemunenaba.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/39034085184.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/91197033435.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0874b66c22f3bdd65c4e66eecf91a810/83898071477.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/76343719660.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d8e892cc696c794ca7ad720718c05f1/87692869860.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/kivuwezusepixatezagox.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/86793168286.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/kudiwisujakajowapa.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/josazo.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/10655705899.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbf8b4d23---35842001577.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/rumixememulavipasuvutage.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pamaxeze.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_off0000bfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10764 bytes
SHA-256: 7d6e39e676912e4d6ca5ea2d4e3f509c634fc7ea41dbb041069e67684b845797
font_02_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 17248 bytes
SHA-256: 87ea78bdef5ad883d14d8aceaafae72f859059e43314e1ad3defd50019a11576

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