Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b90bfaabc4237f8…

MALICIOUS

PDF

88.8 KB Created: 2021-08-13 16:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 034dad668894581768f8735682bd4151 SHA-1: d39d5801bc342216ddf0483001fbda41eb870242 SHA-256: 1b90bfaabc4237f89c894f09f7c21f184e6d466b85deefe61f441bd9dee113fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=what+is+the+3+in+vitamin+d PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4012f060df---60519307091.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608663e6786ce---fipigekogimufojefi.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bowidekevomirakubige.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/71372993041.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/biwolamezividolobigin.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e1347fad0fa3324a57f9c8a21f3e208c/zatogeru.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/8283047961.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/51281092de77c541cb61c4aec96178a5/51764586567.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99fbe4513---gamewezawinaf.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/lofibitijigokove.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818199a45ca---17975911499.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/61126849306.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245ab16e0d---82577361079.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/zonapabovuruzo.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/92812189450.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1b1e61de---15070842636.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/b9essgoh9jqsa6e89qjp3smrm9/jamezoruvelutaralubivaf.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/ziwakusimixas.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161118ce686ae7---15060688009.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c662f54e---zodizib.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/99554636305.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/suxipuxasimiwevo.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_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 17476 bytes
SHA-256: a823eb6a57ebdd19b33c78a5038253342ab9c56c5291ad2de580fe6bdb616bb1
font_01_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 10480 bytes
SHA-256: c477f2741d2d4003c5e75b408dde77a702a21a3281e7feac482f4e9b3a0c09fb
font_02_sfnt_off00013cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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