Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0252aa37860578…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 09:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16ade13c65b2c9a7301d420eba2f05d9 SHA-1: 67ba3fc534044dad585d236a10ef85308501e69b SHA-256: 1a0252aa3786057882787d080d688b336fc20313cdf3741ae63134e4253c2b1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple websites, some of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medvor.ru/uplcv?utm_term=compare+redmi+note+10+pro+max+and+redmi+note+10+pro PDF link annotation
    • http://toyotaquangninh.org/data/dulieu/files/vemesibudejiligunajuren.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/fumazotelaxox.pdfIn PDF document text
    • https://maria-galland.ru/files/file/52630801484.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/20918312161.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090645957_687356558.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/15722224574.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/negesuwepojetoxu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c717b2663---tasokuxufujakipux.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/65999451588.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/givojojen.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/27631076297.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/35440243731.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/25932800093.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/81108740391.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/41518256857.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/xobube.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/51254355400.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/fowupumokagofuxef.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/89318028834.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/futimoxaweze.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/58759529378.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/velorixodij.pdfIn PDF document text
    • http://billsky.ee/files/file/79351479724.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/29850102357.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f439d6f41e---gufagulavut.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03751fbc3---57118401663.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_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 18200 bytes
SHA-256: 313af431a00be62588607ee1a8eac6dc89575dfc53beea1bb1faf416f2e58f41
font_01_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 10648 bytes
SHA-256: b9fe1f5af9904beecfca6b07704be8f21215cb2b59a4bcfa29e0e0b8fcb8190b
font_02_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1