Malicious PDF — malware analysis report

Static analysis result for SHA-256 a868a2ddd353dd62…

MALICIOUS

PDF

127.5 KB Created: 2021-06-28 17:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 387ff9ed6668288859a809fa4dfb5ee3 SHA-1: 8af9c455c160e4ea4c6843f3dd00584d15db0717 SHA-256: a868a2ddd353dd627cfbda8549ecc5d77b6216969612eb6d28dfd38b7ab27bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. 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 embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://axiomestates.com/userfiles/file/72576121879.pdf In PDF document text
    • https://mangonebike.com/uploads/file/taxonebo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac18455dbf---52024350369.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qjlrs12fv92bvibno24o3v3vvd/vagekisovanawofizije.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c39436cb899---gaxufuginurut.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160724153b5961---79551397676.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p2ecm35iq2po1fqcmlh86padc6/kovarezagasagowij.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8bd787125b54ecb0f2006022a18a4430/39440944411.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/nepomolaxit.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088f236843f3---3717059663.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5827090e56f363db39e6c7fd5ca2baf2/10027653040.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d3008814c2059e4b30de087ab8d9e0c3/foxejasejob.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c09d00b9fcd27a5ad201abba78e3a13f/lagaxudivaziso.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0audnustfiaemaqur4n1lq3s9b/xirovovaweteniviza.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/mizasupu.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/zazaxurewokajebelawel.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/9be4041ed29d5eba32d29b7b5bffa2d4/nadanevirarumejibajugem.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/25106002794.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d46b94a5ebf---45889988882.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/36436499225.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d6a49f08---xarinerofakagulawopogov.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/zozuruturajanapowut.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98e23ac62---40356600257.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nowofufis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+watch+the+fate+anime+seriesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001850a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1850A 2672 bytes
SHA-256: 94cc9d200f995a44aef89865a1110c5e7a5898d83975a73e6473104110de263d
font_01_sfnt_off0001907c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1907C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A88E 17968 bytes
SHA-256: ca5ef940179a0b41fee4a6b8ac5d510f8d30c0d8fa4c28feae738af538495f57
font_03_sfnt_off0001d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D765 10632 bytes
SHA-256: 8672f071849a220c23838e3abdc72e7dacf8e270763ca2808ebf5c12a3b139d3

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