Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f29fe5a0312e1f1…

MALICIOUS

PDF

90.7 KB Created: 2021-06-30 06:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f2c7c05949260a46a9268ed2525f5b12 SHA-1: a98fc5b9b9620239b393e6f321c718fe3f2d651c SHA-256: 3f29fe5a0312e1f177d384d0b42caa5ded1d4ef3c78f55dbf7346c9c98dc210b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, indicates a link farm designed to redirect users. The document body is heavily obfuscated and appears to be non-textual content generated by wkhtmltopdf, suggesting the primary malicious function is achieved through embedded links rather than document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://infrive.ru/uplcv?utm_term=now+is+the+time+for+all+good+men+to+come+to+the+aid+of+their+country PDF link annotation
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/kel3208c2nf5nd2n96sscif075/wuwepepojajepanitanexe.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/88013260951.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/subiwepivobisitifizefiloz.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/firutowerarugusibunamowez.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kg4ba6vg2pru9q5eig3990r2u7/37080409073.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/49797596251.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829fc70aedd---3947792234.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///lukixuzirugoti.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/rilevagibofuza.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/64789096356.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/i8gmb4cra3n4ltpelb27nvpvpa/vomamenobuta.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e96803edc---tukaxuvewi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/735cc9b476a37eb2619b0b08208b64b1/lugof.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae783649ecf---56384435871.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/12795806822.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a444c273950---jiwuvokapapi.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/54115087684.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/nenesa.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/pirawalosomiweduvokudojaf.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zapijumipuzabopeko.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/xudalagokebepob.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/66256416563.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd7c852859---88476611824.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0nkicgftcdc2icslifl2um98v2/girujidexotezubowo.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/25091385688.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071db261d6b7---83901999910.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a7ee8105537a27916327bbd2379eb7db/95895821067.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_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 11200 bytes
SHA-256: 088ea6d1547bd9d6c0fffe1ccb1bb3bf9d845a6f26c0a87f23c7f7fb45a862e8
font_02_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 17024 bytes
SHA-256: cc1b2b888140a286d9cb77d7fa3f28499f1608d1faa494539ef2d9fd99b24410

Open this report in the interactive analyzer, or submit your own file for analysis.