Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b9dfabb59afed…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 18:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c4365c2f4710a6e7306a4a73d1c32e4 SHA-1: 5abe72a021f30cb83984499382933430a7e1f07a SHA-256: 828b9dfabb59afed5db0ddd50dcfc6a4362f5d0ade7bf7664c9bf3a4f1bca466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, designed to redirect users to malicious content. The primary goal is to direct users to phishing or malware-hosting websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=pioneer+avh+x595bt+manual PDF link annotation
    • http://ecole.ru/text/images/file/bomexixoxun.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/jigusibi.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/50918467416.pdfIn PDF document text
    • http://patroha.hu/file/xosovozedikezonud.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcd41025f1---77922517767.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/db1b85a837f7af2c708722cb73bd8743/32540171063.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bujukinuwajujepexav.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd63165f85---xaxutokafuxafiwolujamula.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/gebebugixufosulewovezow.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb332f28a---nupebusimesisufisoliza.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790be09ba61---72248903808.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4d773984---42501805312.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/jaragekiwetarazep.pdfIn PDF document text
    • https://blogsma.com/files/24509340857.pdfIn PDF document text
    • https://netpage.info/userfiles/file/zivinopufuzamemobediriler.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fmeuk7v3d12nnbi8agrh8l3jlo/3430919453.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/98220868123.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/21278665043.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/29516766454.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///90788345223.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/70310954942.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1k4fe14obeul3ona301f2ht6va/18526956433.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/dutigugunakobix.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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 10916 bytes
SHA-256: c4c8fd1a24e347b0471d8e9f0040a7e2ac2b90b6da1af95bd3df3ef7e398a8d8
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 20532 bytes
SHA-256: 278d226d36422417e6adf7e82bf196bcadeae3a1eeb3701a60724180684fcee7
font_02_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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