Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5c0a7ceb3df31d…

MALICIOUS

PDF

76.1 KB Created: 2021-08-16 03:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f674c7d88b08db8cfe03265bfcb6102d SHA-1: 986616cf4e956fb5f61cba950f9526746dc0f87d SHA-256: 1b5c0a7ceb3df31dd0573343d8b944b9014fc7d8b2a13a60b74afc6e63634fac
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 detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate the file is likely intended to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=present+continuous+vs+going+to+exercises+multiple+choice PDF link annotation
    • https://tsegypt.com/file/pakuzupisixafalopiw.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fec3d5c4db9---wejoxavugubozudusona.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/julutotapewikalutulobofim.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/739005f6ab9c6474e17a485ffa25315b/6652330157.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/39744641040.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16112d714a978a---patovunupatiwisotupozuwu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ceda37d3f---24655466909.pdfIn PDF document text
    • https://ocw.tw/uploads/files/91755495032.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/17885586448.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c770fb3eadb---sekulotalatefitunoxaxuguw.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/36621296042.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d748a630b66---jedanubopupuxa.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/34143648475.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/mosuvuripi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dae837225---mixapolivuk.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/tijage.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0b7d7d75625aaf45b9623b631f45ae6f/91801823641.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/85385d51ecd978fd1efd3560278e72bb/68265984052.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sofifojegutojolavelakefut.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/76939775046.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/83631e709a917c64bd4979386d88945f/46305487337.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d448ea40dc1---51736334684.pdfIn PDF document text
    • https://digireg.cz/upload/vavatakubizuriwizo.pdfIn PDF document text
    • https://cncunse.com/d/files/58980862221.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_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 10928 bytes
SHA-256: 46eb14634c3bf24dece338cf9ad70e01db6be7beabf141334be91d48c1cff303
font_01_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 16032 bytes
SHA-256: ae94d34168ea97e23b30364110482a75489ed525bad7ae8995cc4061657ed8a8

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