Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6201994b6d15e43…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 15:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d370f8e1ceaaadddc58813857354de96 SHA-1: 7596e660f7431b79954abde52c0c5bd27b211ce8 SHA-256: a6201994b6d15e43dad530c3bd013ce17eece085c5cb9184f90bfabdbb8cdc27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=can+i+use+my+phone+as+a+bluetooth+adapter+for+pc PDF link annotation
    • http://www.cpiequipos.com/assets/images/user_files/files/82149307523.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614637f27628f---doviwifeputiwesabu.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tumutizafutigafopezekijo.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/bilutet.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/sisaxubufa.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/fefuvitilosililutovase.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109080712417752.pdfIn PDF document text
    • https://purefeeling8.com/data/file/doxovekizuloxazaxade.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/mubajiruret.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/vafipakigodiwebuvawixoji.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/53711809078.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/53826156247.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/musetijirepa.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/92438960257.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/kelubetakixenetolo.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/kupujepo.pdfIn PDF document text
    • https://laser123.com/geektic/files/26180551881.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/rinuze.pdfIn PDF document text
    • http://mopron.ru/upload/files/17458851266.pdfIn PDF document text
    • http://pvvc.cz/files/47228198485.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/13481654067.pdfIn PDF document text
    • http://jawarakreasi.com/file/risowipep.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142bc336f4c9---52810083987.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407d4ec9f94---seperijedifumeminolido.pdfIn PDF document text
    • http://asvpp.fr/pdf/zipaxobalosakifomak.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/mavuv.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/93707485939.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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 18176 bytes
SHA-256: 49b81ca909148262356fc6b0695cfb39a2db5f54960bbcf491f9a2df16397351
font_01_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 11268 bytes
SHA-256: 003e08f8335a1d9930b950617267842c103ea71f9f43bf067476ef05d512abec

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