Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b613759061f026…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 17:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2d093b144338609413c9174a40af474 SHA-1: 1235b649d07e09ebc40b7834659896469819b80f SHA-256: f1b613759061f0260e6da213c402c930f07a120b38f456aab4508c47cebc818c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://synerhu.ru/uplcv?utm_term=call+of+duty+4+modern+warfare+apk+obb PDF link annotation
    • http://atomicattack.com/atomic/fckimages/file/livewedavikerowi.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/vonibumasusolulegifigewo.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/50551872941.pdfIn PDF document text
    • http://lovesenergy.com/file/mawomewivadu.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/74507685156.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/wagafew.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630727928.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/22914160662.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/pisimupalizuvimigazewewa.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/monotatakevewejetamir.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/14278292583.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/pobekilujigufus.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/kagajewajo.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/sukubomelotojije.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/xepil.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/sivofejotorak.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/36dtnrdfjrracv2muv83n2kt45/24038268751.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/wafosuporekesesofuvine.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139919867582---risano.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/4812308737.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/62119598385.pdfIn PDF document text
    • http://svx.su/ffile/file/bozutivokabiw.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133fbe593384---rogomevijodijoma.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/zolisanutasibudugewog.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b48acb3c---65866184226.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/63619601839.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/rewuzir.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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 18136 bytes
SHA-256: f34db1d538004601b2079f36e04106f6dac084591f313ac1ed055c2a4606c5b6
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 11040 bytes
SHA-256: 4d0b9801fbc87d4fc78a90c0d519a7f963071818288b78ad15fcf6ada4b7d15c

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