Malicious PDF — malware analysis report

Static analysis result for SHA-256 0652a985d3833ca3…

MALICIOUS

PDF

102.7 KB Created: 2021-09-17 18:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38946efd685c94b593930d12518e3a7f SHA-1: d9433473bbe023fb3a8dd5c30c3addcdc1334341 SHA-256: 0652a985d3833ca3f145c90bf6a0fe239c1fe8ab787f0c12e9d5bf151a15923f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing lure or a mechanism to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kppzp.pl/userfiles/file/82099293009.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2cce41cfd---diwigikakenawudivalib.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1cb5353a65af1a0cd22adba7931c30af/lovipaveworu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/oaf0sb4tapng4tv08unindrgbc/lujakimekawoziruridot.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zedovorob.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/kiwabativumewajavimawel.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/baraluful.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/kujubalinunikipix.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/64618337704.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/24702833645.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/likedikag.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/43455042405.pdfIn PDF document text
    • http://koutingchina.com/upload/files/soxifimanarerefebakobobe.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/naxavu.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/21836148307.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/fogosikomivorewumexo.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/51974320888.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/17248393043.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/26330262345.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/17502758302.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/rulumajepepogamokupif.pdfIn PDF document text
    • http://podushka.by/files/files/bozutovubiwofo.pdfIn PDF document text
    • https://people11people.gr/uploads/File/50928433799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=which+country+has+the+most+desertsPDF 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_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 10796 bytes
SHA-256: 283828c2fc905b874aa5cac8542cb2a9134af69d024cc8124becea8118891f72
font_01_sfnt_off000141c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C3 19524 bytes
SHA-256: 4141104aed2f807bbd40b9a0d1f2b85ea75c58eef7b82050fab0745ea8892fc2
font_02_sfnt_off00017563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1