Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fae2e9fcdd36ee…

MALICIOUS

PDF

91.4 KB Created: 2021-08-08 04:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4830435b1d7336e136e4a3d48223bd57 SHA-1: b068567c9e752b900446b5e37eaa4b7d20526b8f SHA-256: 03fae2e9fcdd36eec2f81a1eee3cc752435b3ab19402823f6fe97e8a4b74b5a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a link farm used to redirect users to malicious content, potentially leveraging a JavaScript exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://chcial.ru/uplcv?utm_term=what+is+a+tan+belt+in+the+marines PDF link annotation
    • https://www.disbel.es//ckfinder/userfiles/files/tilifofunulibegop.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/52e04a0ed579a57e95087c4cda86fd6e/rivokixuzasafavinejisali.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/fuvanujinariri.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/40558707874.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/18991059391.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc105d920---99484784236.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a5caf2373db301caa98b760023326806/76415516787.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/db0cbda8f19a13e62d1f36a5c4917233/dudubukavewapexaxe.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/tufakalezuvekokiwad.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/guneguzoninuxemofopuxaka.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/74710482060.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7142763bec65fbc02f24bb745722addc/rolalusetekupo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/52143957676.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/50630790449.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/batopu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160781f53c444c---jusororufepojituzibiwak.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9afa197cfe---46515512851.pdfIn PDF document text
    • http://polkovnik.su/upload/file/tigasafopaboruxijuboxa.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/34448252953.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160faf9af3bd3b---gukidaxi.pdfIn PDF document text
    • http://leton.pl/userfiles/file/jemedopi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/gp0dl1hf0plb59lmputourjnok/fadijuto.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5342437eef---kutos.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ovttm71240uhmv2d51bist47ul/fegenolutalimu.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_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 17424 bytes
SHA-256: 7ba4f2b5e54020b3d052eb753537c9d1711c17bb05200639df984ab32141d54a
font_01_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F9 10388 bytes
SHA-256: 1037ddf6f32a620ce6e5a69cc08e540dc03a917b3814a1a821847da9d162ccea

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