Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a11edf328d7ca9…

MALICIOUS

PDF

82.7 KB Created: 2021-08-12 18:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4c650d2ceb5df0f989514e761f4fa2f0 SHA-1: 9f6d339d60ee16a0b93fd0a74abd1f9ee6263b2d SHA-256: 11a11edf328d7ca9b7a6cd474e34d8a63a51dc6997633851d0b2866f0a6c3a67
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many of which point to websites hosted on compromised WordPress installations or other disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://helder-effect.nl/userfiles/file/87605621629.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0e88a72d59634835011342247334cd36/turevevejexikegizesunabu.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/pubabes.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/30721726772.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/116461610.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16109464bdcb25---87147637437.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54de582082---joridexevotoneladotoxude.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1191ab93f---39533279829.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622172498733984846.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/58285303564.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/28/file/20210528_072813_109.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/61f80530e23cf6ce50b48bd8606aa012/lugeronogisadajifi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092947ee42c2---nunatobojoterugazawe.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773920dd790---74756480473.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89a2358e1---93669755869.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/befegobasikufeneruluner.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/16466164840.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/fabinumugitilexiza.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3905a4514c6af7ce902e1533a0ba8f4f/50735864737.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/difobitaxiwin.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9862eec317a7c36222f404bdf540795b/37275723695.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/0hd0tn47dpbpiu87aiio5042si/zeker.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822da55ad1e---72873564820.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607487fe4d2eb---fovafojofise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kabhi+khushi+kabhie+gham+full+movie+hindi+hd+meinPDF 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_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 10992 bytes
SHA-256: 4479331bdd3e9625cebe5ab008df5734ba87b167b209a1acde9d090691c18dcc
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 16220 bytes
SHA-256: dc8078c0ca1700f08705b5152c1c108540068df3d5c02df9f83c114863c33f70
font_02_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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