Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92bfeedd8f46a29…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 09:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fb818ba6cda9edaf90a0b44f583886ac SHA-1: 80f1c2af7f9e9eb155c92a3f77aadda4ec7a4773 SHA-256: a92bfeedd8f46a2943436fd62e405cbe1eb7030b5e1f1e8ee5b0d991f0b50ebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=months+in+russian PDF link annotation
    • https://aldurra.ly/images-editeur/img/file/28655587394.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a1bc0966cc87fafbf6265b0d83d6659c/kajudagitores.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d0e21d406---kikewen.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6e9f2e12545d5ea100423ee96954d321/lutalunovovegenebapoxa.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aadcf268e71---73058396500.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q7jaqer291pb2ev2480s5cb1f1/busejemokaxa.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/jekomusimirarenedawunopix.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202153232366586.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/50460040586.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/fejuwefuwogumijogewojurod.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e7f2606421ed1648287ffc8624bf20bd/29812910837.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8e40b1a60b1bacd8f9d14c33ea7576ee/59245894519.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d770a33f7---dazavaduvitona.pdfIn PDF document text
    • https://khanikango.in/file/tiguk.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b1ed9ef4e---12376902619.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/16200836116.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/83444594210.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/33138745353.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/de045de47288c6abe0949f6a0df00eed/wuzubuvepibabenoveletis.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34cd189d4---26153463937.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1428d9adc---nukodomik.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/97891b0e86878a8a3fcaea923c8510bc/vadizasiwowi.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f925cbdd58---luvepunapuka.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8162025368---nejidekipurulu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c717295a906fd20a699f7903aab53419/65928308350.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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 10120 bytes
SHA-256: 897c3b466f9e796f02f2442ec144b1948a2985ff16fef96747494582d0b8bec2
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 22608 bytes
SHA-256: 49be85a9866e806be846f17bab70c99a64c689a5c40ccea83c90981d756ee7c1
font_02_sfnt_off00013bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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