Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62caaa26b4072ef…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 07:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9f09d96c19832291eb926706296573f SHA-1: 021f9135fc0cb04f66a9871e7ee0b462326ff416 SHA-256: d62caaa26b4072ef869184be8c7849649ae7e8d8fbf632c6d6ba4fb972b0f504
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains or compromised CMS uploads, indicating a link farm or SEO poisoning tactic. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly suggest a malicious intent related to link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://asi-filter.pl/files/file/koxigujatufifiluzixunubo.pdf In PDF document text
    • http://runbo.net/upfiles/files/16289350604761.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a7ab8354344af2ddc736072cd2814286/79890187562.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/96794997554.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fde9ec47007970443f4a4723c56fea15/kezadiditewenelipol.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/nuxamawuvanabavida.pdfIn PDF document text
    • https://badoza.net/userfiles/file/lajofadizuxepirekatipoli.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/velojawonipulaxusoko.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/ligikexiga.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/frdq5qr8drafbijled5rhnbpn7/mizedetefekufomijuxuwuri.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/60041231911.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/46481928421.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071294f98701---gimesebuwojusadimuge.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/17833288976.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0d93d9f3cee66896019c7a41f7ed023/rufebesejaze.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d451d7fcf6---latajerawoj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f14356d0c4---nonabeb.pdfIn PDF document text
    • http://naucseto.cz/storage/69447537831.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/2503495946.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083d82eafbea---59904046770.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/d0an57s1jmhid57ibnp62d0hv2/65552727158.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/befalupaki.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e26d1a8d1---famom.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/ranizezevulebazinamewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=molecular+recognition+and+supramolecular+chemistry+pdfPDF link annotation
    • 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_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 11272 bytes
SHA-256: 9c4af02d550e57e9c1179111e0e0277204d995e62188d3acec9ca07fb1b45a98
font_01_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 18284 bytes
SHA-256: be164c05961c974dc0872d2267beed36f41b3947ea2b3ab6b62ef6ce73cefb7f
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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