Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35577fa7684a627…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 21:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b99c0be02c0fb5684b645872bea124a SHA-1: a2917a6d9345192a38352618cf53d30a9cdac226 SHA-256: e35577fa7684a62745fde208fbae8a41d96f1074b88d221d01b7a89cb03c85c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The file contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content, possibly disguised as a PDF reader download. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=pdf+reader+for+windows+7+free+download+32+bit PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cceadb81d---kuzunalu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/118cf3db30eb3250d49ba7bbaa00263e/kakatenujoxu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581bf15c7b---89463214045.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b068f20528e---55213077011.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/pakixekelajuwes.pdfIn PDF document text
    • http://rockghs1965.com/clients/8/8c/8c68d0bbb6adb8fad5f76254a0516489/File/65031223809.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/tfkhmomgjilu14fg25ap2f5q1g/43537967283.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfe6ac35d4aee303703118512c6c2dcc/35798960031.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/tedab.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/2473926669.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/xeronodanap.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610eda11d8de8---jerojatibi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160961723cad7d---4199054792.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3e39ac3e27eaf4732caa5d6898572f96/42211850492.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/gofam.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/fefinerixakiguja.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/42265805529.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/nuzagabemakowiki.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/35067460756.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/3j10vpksp1k90vn0mbfvheet0k/riwazemulezewojodolaj.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/duvevezunijoluzamele.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/51737771125.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/kejipezekaxabopafa.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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 20348 bytes
SHA-256: 25102c286efe20b45468e79f643df1a14a0c212602d32093e25dda839a43d27f
font_01_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 10916 bytes
SHA-256: 24c01c4bdf0327c0852f4ec3bb0f8c94409027dc064af1235b4fb1949024ebac

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