Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3162d052a47e003…

MALICIOUS

PDF

88.6 KB Created: 2021-08-26 01:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31962d307203cd03f66219d12d86d54c SHA-1: 91e29663ba85cc25f54b4167fd36695b70c16c8a SHA-256: f3162d052a47e0039346045abe4e85588526c7680cef4e808fb3dbc18fe24ee4
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, with one URL specifically containing a UTM term suggesting a lure related to 'hidden video recorder android'. The overall structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=hidden+video+recorder+android PDF link annotation
    • http://minerva-collection.net/files/files/20262546930.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/xopenawegigawera.pdfIn PDF document text
    • http://normel.org/files/upload/file/vumilerofunosevegimalawut.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/vafejikikupilulorijoju.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/98672445726.pdfIn PDF document text
    • http://drironcat.com/images/file/3587169731.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/vojalipazevami.pdfIn PDF document text
    • http://tano-cable.com/d/files/tiwanaragilamowukob.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dcpk5rhp463s609sa3vajsl5ut/58713247398.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c469f9d2316---suwekarovibegerul.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/35168491803.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/jakowutofasa.pdfIn PDF document text
    • http://nuestrasenoranm.org/clients/8/88/88a18899c67a61641ca1f7d027daa919/File/30121679830.pdfIn PDF document text
    • http://chapelguild.com/images/usr/kofefawuv.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893c2f26f29---50492018989.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/73978915826.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910deaab647---fiwom.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/grl1o6bs4cv6nqjug3023q26uc/weguxajidifogulabakokos.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d88d1f417---xafexipi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4473b27e9298972144782f60478cb646/53874837267.pdfIn PDF document text
    • http://airetechservices.com/userfiles/files/lejotimirop.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a81ec3ee6944797afa7a9cc15db23104/jifemunaginuxolukusori.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1c671189---zutizepiziwi.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_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 10108 bytes
SHA-256: 88c1e805e75814c54cb726d07c5442ddfffae9b3e0895951fd12a1b3336d93a7
font_01_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 17284 bytes
SHA-256: f0a5835457cac8ba11c0033dce73db78739e5ddf22827aa55e0b2aa93914d1cb
font_02_sfnt_off00013be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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