Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3a507bfed4767f…

MALICIOUS

PDF

96.2 KB Created: 2021-06-29 08:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 40eb524f59bf9b19d595557eb8950362 SHA-1: c87085863a0bc141c518e28553f8ffacabdfd6d3 SHA-256: fa3a507bfed4767f57c344dfa867bbc4765d398ad6c7c7bb2c332f7bcc9a8282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a link farm designed to redirect users to malicious content.

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://inwebjor.ru/uplcv?utm_term=gretchen+rubin+the+four+tendencies PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6558264337---96035083890.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdde61677---nuluruse.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nsgkjensjsjrl875vl5862fpk7/mejewaguk.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f24937bd6e---fimalerabe.pdfIn PDF document text
    • http://pusulacampeyzaj.com/images/media/files/54691894643.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c545b893c17e15c735d98ec92fe8f1a4/37325265897.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c51e35ab4c1d74a09d00d3efc8b17381/konavevimatat.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/859a35d165056f182c38c6086b6e6718/lutatuzojabuj.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ede5f7dcea6bdfe8e8d76cf7c5308827/41797437415.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/potanunutegagubomo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9a4124bc5b9c7b398f6658f2367d4bc4/60056826720.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/63917867311.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/zuwodeloxevaxeluxinota.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1beaemqtub68p5rei7s5fvuank/xebomaw.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cb85247620c0ecdffa306b99ac15f68b/guzupawurupewidike.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/bbbk2rk5kcoenn3p4eet5e77om/gonujik.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c084e2e3---65919486423.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ad1f23944---vagizolakirej.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609699b813cc8---46059550190.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ms2q4bg83bpqa2js5qgcc86b9s/80712407370.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853590c06b9---minoxuxasazatajalibe.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1585b87902276f2c950af28fc7096459/19586140159.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/406cf6711d8256e8ac45cd028c9fe3ce/zakuxas.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_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 17660 bytes
SHA-256: e9a4e14cda32ce5a0677536e6ffc5a195b916f41e701d228c57792cebd0e6815
font_01_sfnt_off00014319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14319 10644 bytes
SHA-256: 762655e95a5a5de7e161b2e48e4f37304ffcdec5be1eaa9a25d6bd797a7e7b82
font_02_sfnt_off00015b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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