Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5cdd9b4a3352e0…

MALICIOUS

PDF

112.2 KB Created: 2021-07-16 03:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d344d3b770ec60272837d58af2df42e9 SHA-1: 81c6db2f9501808d6e8cf71d02e98b0306219400 SHA-256: 2d5cdd9b4a3352e04ae018c10678088414f895f654f42e9da57b9d274cdfb5ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites, likely for phishing or SEO spam. The presence of external URIs and links to compromised CMS uploads suggests an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=which+of+the+following+substances+will+produce+both+glucose+and+galactose+when+it+is+hydrolyzed PDF link annotation
    • http://tunglamgarden.com/images/fck/file/tajukelodamomamomuxisutu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160713307f18c0---35634759564.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/58713112708.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/59481962222.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075280aa941a---8614341862.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de30efa2fc1---71823549145.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/28b058bb80d5d390e972f98145fcb884/55287831137.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1f17e4d7---84640069016.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608498864faae---76859908288.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/271705048050.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a63e10e3---34625252187.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/80913279868.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kojubopejafatidaratuxo.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad333eb706---bokapebaripujomowuzudolat.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/57806979126.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd6f4132f---74114827102.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/22783484320.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a41bef276026700937854e3382bee4fd/rukizezabejetasuxiwusu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/49463e2a9f07cc113d8c0dfc90c43b19/76755699016.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/87095848039.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/pusapiw.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jqdgdo6icokejp55if74aso5na/pefujezololufofi.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/senubinifiviwob.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_off0001501b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001682d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1682D 17976 bytes
SHA-256: 3522af8f1b800879bf7a7c76630c3ce8cfdcac483666c65f7c7ca26177417020
font_02_sfnt_off000197c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C9 11392 bytes
SHA-256: c6cc08fd1ab31caa067f9304ba8d3d7de7b8329319e0e65c76b9286fe97d285a

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