Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8928bf7628d144…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 02:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45252e2072bb555aad2b83518e3dc475 SHA-1: ed13ee48c8945cfaee011cebefdbad06839f7528 SHA-256: fe8928bf7628d144a0f7a66664d93d4ee63ddf061e20e60e911e7f2b0cd6f4f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://philabc.ru/uplcv?utm_term=android+apk+on+windows+10 PDF link annotation
    • http://rotarycochinharbour.org/ci/userfiles/files/rivozekotodeveb.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/naxitokogotemajuseropoz.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/doliguruwobofubusiwe.pdfIn PDF document text
    • http://webbuilders.com/files/file/33385272358.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/sotuzuz.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/21840940829.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/19938133302.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/pevoribugajidor.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/61648514630.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/56745191280.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/60541969661.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c9585bdc9f9ad2a6715fe35b578195e5/ribopugivilirodibugugifak.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/57890163428.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/29601521255.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/65635955225.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/kubumuxevevusesufarunejes.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4e59f94a---memepon.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/on251tn3bem8rbtv5fvpapdq3l/lolixugosetutupite.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/moveso.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/4738979629.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210904_3BD31B600A576C17.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/ruzaforobibato.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/bebelosovaxetijezugixuvo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB681 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 18584 bytes
SHA-256: 32de2f79393b356c7f912b12fda7a96ad3fe20aaccac24a705546a0c3366f554
font_02_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 10440 bytes
SHA-256: e5a9aff1d145d3811b6b99df01e2b9696982ac52816303cace17bb85da02456f

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