Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcff23a41a282fb7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 23:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ee6935c4d6696f2f5a840e294b266c3 SHA-1: a03aa303fbb187e2de5d749759f8bed2a02f9434 SHA-256: fcff23a41a282fb7d59b4bc8c174980a640f5ff3b88c5ad9a1bdcc204283eaca
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites hosting PDF files. These links likely serve as a lure to direct users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d02133b17---29394101503.pdf In PDF document text
    • https://stijsr.com/userfiles/file/64909766889.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/jujiwumizoketilibaru.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/43034497349.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o5b9o0jvsrf4gjka5velo2n437/77604364894.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/regowebobavitipiz.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611a991f6335b---42874293642.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8a2e39f414d5c36a421f2560218d525e/biralufareraxu.pdfIn PDF document text
    • https://kaimano.it/file/84472598179.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kilomilijewarixiresuvus.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/fizifoxikidixelotiroget.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/v9ln3gklccji4hlj3sq3ee90v9/sifinulazokogiw.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6920ad0353b0ed506351b68fe9fa2b71/39859082404.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/33917239836.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077966584264---sowosofeninadekara.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba741d3984f---84384929148.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/pegijuzavuxigufokijik.pdfIn PDF document text
    • http://coffee33.ru/archive/file/99287333896.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/53390919010.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/57968703308.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce10dcd127---55671930936.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/62939041871.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/al8jg9iiltpv3ht5v021bsk9q1/sikavijebedaveni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=que+es+marasmo+y+kwashiorkor+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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 17864 bytes
SHA-256: 1504d854622af129853ec0c805a57fc91de72e15b13ed34896d4c6c96682a119
font_02_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 10968 bytes
SHA-256: a6e9f7f36f7fb960f18b9509b63b95bfd1f3590cde7ecb3687409f5a4bd05456

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