Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63699b6635869aa…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 15:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 578ab235356598ca3623a9c9c7ae47a3 SHA-1: 57a9cec43e8e3ca5ddcb9c427e7a308ad5571903 SHA-256: b63699b6635869aa13bd7117753215acb997f2354743ef3f1f77d01e4f55a45a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=athletics2+summer+sports+apk PDF link annotation
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/82f02df56af98a4b243480988169e837/gonibapemijovoxonazi.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/xunasojolifudiwuti.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/jenoruvononogemoxunemet.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/vuziba.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/9757952871.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/13238038030.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109060023327209.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/53486839391.pdfIn PDF document text
    • https://atiksigorta.com/files/97568266184.pdfIn PDF document text
    • https://reniuved.it/file/20167246987.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/80551555261.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://pnmanagementsolutions.in/uploads/pifiwirifito.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d6eb52e3bbfc54be9d23d398430b87a1/77964938985.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/mijojixepowilexuxebab.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/jakuxo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bhn1c8v2lgp8ssvrq6oqlq73ka/28473417972.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161395a0477a0e---gitunemovag.pdfIn PDF document text
    • https://akconta.com/uploads/files/80654532015.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d854e9cb7abbb7feaaf6ee1d250f0e3a/wotumasapisilubapif.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/tedivifevubatexakirizova.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202193144597980.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7ea038578537839a15481781ac2c307c/koxabadozima.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/75469762385.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/vevunozodumup.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/petide.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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 18684 bytes
SHA-256: cb10a14c3595b1bd1a8da6a92ddacf7b1d8c5dfa153a2048547d49cfed27a8c6
font_01_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 10828 bytes
SHA-256: ee23977e42ad9f0f0ef32307db3f21a68cd36a277ed7dbe3ff97e728185a5431