Malicious PDF — malware analysis report

Static analysis result for SHA-256 f562f65ea7bb1583…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 09:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d4e8010a3478b78919a6aeec5a1f6d8 SHA-1: 35ddc8f5f30d23a503ce05f5c3cc2c4af7d1d1bd SHA-256: f562f65ea7bb15832f6097f4be9e0074bd093c465ce2a19b215974e931cd7584
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=oxygen+concentrator+online+price PDF link annotation
    • http://biblioteka-belzec.pl/upload/files/11275858372.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/150b9fefcbbff7a6b84003340e413b0a/judunulanebopif.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/32267905298.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/he7447fj513pb01cvuuk0kv3nh/89728793881.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22f57eb65---fonatonexilixajewewekamo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79e392346---23024531287.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/deluguxuwarevexokekoxipab.pdfIn PDF document text
    • http://mamam.by/upload/File/file/domufedipamalenen.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/94139086490.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/97419635907.pdfIn PDF document text
    • https://sambelteri.com/contents//files/ravojodi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b205205f2---57161374476.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/47935875559.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/bivukivinimodazug.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/fawetosabo.pdfIn PDF document text
    • http://whatdwellswithin.com/file/vikuxakekibese.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b1f263ea4---wugekijaxes.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/29468910735.pdfIn PDF document text
    • https://bfull.ru/uploads/files/giditubebunaduru.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tilurilumalopane.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/23034762684.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/88034770194.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e82684d48---vanodemixejapebisawuvele.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/rokazekibibeza.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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 17848 bytes
SHA-256: 454d665c493c5274aa2cd1c174e284ad5dc0ab8b5bf8754a231c2b8909f4a04b
font_02_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 10624 bytes
SHA-256: 2a70d81e0b827e99c0062da9b610b7cd91bcf7ba86fb0a8d4a6a81e88fcf58cb

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