Malicious PDF — malware analysis report

Static analysis result for SHA-256 7354d1aded2a5690…

MALICIOUS

PDF

72.7 KB Created: 2021-09-04 10:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e5d735b9974ef8641a7bc27168200a3 SHA-1: 36a4f6064fa362af12c54e6878f6a5d2ad5b816a SHA-256: 7354d1aded2a5690d2808ab51bd8801d0efef213ae5752497c96deee3d5513d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware distribution pages. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=ptet+2019+model+paper+pdf+download PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf2a4db9b---metosomudebadi.pdfIn PDF document text
    • http://grimastone.ru/files/xonobosumudubivebara.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7ee5ea878---29216585607.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/56133671681.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///32856832336.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/fizufijibatujolimum.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/17918635857.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc9666a0d---nivinugobuxolet.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/33886621816.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/xikodedinavikepagena.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xopuxugomitije.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/senekopapagas.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/lunasakoloxiz.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/gejonimekumanutokib.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/95296471118.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/posozemupelure.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/puforidijade.pdfIn PDF document text
    • http://ellev.fr/upload/files/44171124500.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f2b24e213---72205927457.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2d1811e262416582133c2967f0001a6a/48087683128.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54a8bdf89---valalasila.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__611C5D16599BB.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_off0000b646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 10948 bytes
SHA-256: 20aa10f7405b04482ae4155634f96cf89dff5d52111897d791813c01815ec397
font_02_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 17676 bytes
SHA-256: 1e92a43b77e9d4ece650b29b757d13631739d2d0bd455fa7fc48a7433b85ee28