Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b07cd2f5dab638…

MALICIOUS

PDF

98.8 KB Created: 2021-09-04 03:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c699f7198cbd57544d53183b8bbe105 SHA-1: 517fd34b9e5bad95ea674c9ab97c8c9ca58ea10e SHA-256: d2b07cd2f5dab6380997930e3a6a18243c70f4aa9c33c651248bd9da5e00c408
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm used to distribute malicious content or phish for credentials. The file's structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://stolocatering.ca/clients/874514/File/sunekavawegu.pdf In PDF document text
    • http://sity-luxe.ru/userfiles/file/vojujifufo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5255ba3f---difarubojarazelolibapasow.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/sivovalilonajenesure.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210830065932.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e45ded71f---levasoniwiketarovovene.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16120178ed295b---29417193177.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/nizorawajivugiduzipelox.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/rugewelobi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7e913f08aade49ea44aedb76adc5a24f/53551173577.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/32473919171.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/netekomidiguxosajalat.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/35065201925.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6246c65f18a692738776f48e33c0a6e6/xixuwukinafitoroxubub.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161276959992bb---58902820355.pdfIn PDF document text
    • https://premiersuli.hu/files/files/75971959815.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/47416622824.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/77opin3t912kqkmg7bjl4949qd/1665607541.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d544bf88f8e---57580243564.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7625eb5b6f---42186118061.pdfIn PDF document text
    • http://immopolignano.lu/images/68798780151.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da73d61ea3f---wamaxemuwuv.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7f90b9cd---zifujogemebe.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f707d6512---45166779570.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc32986c5---61699617567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=prestige+chimney+manualPDF 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_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 10772 bytes
SHA-256: dbd3e0d854f338fcc444c9c2f3dd4ad00aae756b0fc427e89c32bf2a0a031594
font_02_sfnt_off00014ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED3 17912 bytes
SHA-256: 3069b6870e932c26ac66fae52d49717c3d117642e2f472d66e32fa2bf2d5c0cd