Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7764b64235e139…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 19:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3be87d6ec7ecedb89781659b1e1607b8 SHA-1: d4cb23e44230aecab47d437f40474a88c696ee4b SHA-256: 7d7764b64235e139d61becdfea85308e9bcdd040db447b5c8fd034dbdfad055e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for distributing malware or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://studioriggio.it/userfiles/files/nuvipumaxaj.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a803076498b---nojemo.pdfIn PDF document text
    • http://candientuvibra.com/images/file/dotugewozuvukukasi.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/norufosurefiwazawomokil.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/bc19bp3griuncpbs0tkge984jd/56707080096.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fhd118cco4sqkk6lt30q1l2an9/tumidojewiliwamuragagu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a10fd823b---78969665316.pdfIn PDF document text
    • http://dztechfin.com/upload/file///kesupuxamamigavopotad.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/rusonixedogozomosogas.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/xajaweboronaretomi.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/arv86uuku61qdc15r7f3psbom8/18744500927.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vowupidijijopum.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac04448faf---24700305646.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/wumijuxer.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mf5032u7u5i200uk823j4b2d67/59985926440.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/jajimemijefalasumeko.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75a3b5ac5---6196440463.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210817172055.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/24350802014.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/mozuwod.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608889a4a4459---balasu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c3891a5aeb8fcf111905789b8fdc3ce4/lupivolutotodizatoxem.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/sowuxokumoxi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4f1c39ce8f748839e843e43755dcaf92/18640031326.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lukugegubabotewomug.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/jogubabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ctek+mxs+7.0+manual+norskPDF 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_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 16668 bytes
SHA-256: dcc5cf5a9667b1a411278184c4049dc5d6f80d1a8e8f0506a65ef03baf4c6a68
font_02_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 10740 bytes
SHA-256: 862838926c1a3f656d7b773c3bac181cbefe9b4058e81b361b4f8fbf85349943

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