Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a239c745f1c838…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 04:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3f77d4dc553de5fbb1406af6c6a210a SHA-1: ef2d6665300e33f6a9a4612c1e68b1f8a445b828 SHA-256: 94a239c745f1c838631c4b6319970fae61426b4f428dd47ffe1ec3752a5d1194
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The heuristic firings specifically highlight the use of compromised CMS uploads and disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=diesel+engine+emissions+pdf PDF link annotation
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a1ed4b4415955a001eec57b5415f2c6d/sakin.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/75aae1a63233e9ec1b1ca199df371712/44255283891.pdfIn PDF document text
    • http://kezmosas.hu/files/file/zolijajetoko.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/vezojusilirodep.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/191abe7646864916b200f6ce16e70a83/92942544399.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3807a656c---gisagagavo.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xebar.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zofimiw.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68922671531.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/99138993211.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6b312034c7618376de0fa874e5358b7f/gelufotenanenubovoj.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/43107968160.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/15957307184.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/56137947104.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/1802788488.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/59963643690.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/12014036933.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/647f84ce1a3b1a07dc0f05f85971f2a8/bugeragok.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b457538d5cc---runuwojunababazi.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/55147311794.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160770d4b7ea70---faxejug.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/84516145903.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/savigojosejoxaga.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc02cc711---71067691616.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_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 17424 bytes
SHA-256: 4bce0db1befe1f61180ec27be05bf3a75e441734e6fd1c50f12619bc698a9ddc
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 10484 bytes
SHA-256: ed2ad4960ddddfefeafb1747a3fef0f64bc7d83a78ee31a86b453aa1c33898af

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