Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e0c90f946cdd833…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 21:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44e9da3ad4e81a90724f34b1180bb2cb SHA-1: 30310fb809d4e0282202540882ad73bb4cb194a4 SHA-256: 7e0c90f946cdd8330b75b1df226248ef3ad26aaf5bc93fcb5d7bfb0f3779ecb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are identified as link farms on disposable or compromised hosting. The primary function appears to be redirecting users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=iemu+app+store PDF link annotation
    • http://npi-management.fr/ressource/site-image/files/16317096085.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/93343236883.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/48396580827.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/44621381340.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/20c0e81a6256d5bcf1efd3a6e1733ca9/28077555675.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/28404260878.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///jigoji.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/80052999691.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/xubilavudo.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/86990125623.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/lajurisevulukiwusadapu.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/fomubefo.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109160156583089.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/33901815931.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/85157144002.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/soxepotigafigo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d78e3b791---godoforupop.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/zerilimis.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/10719551940.pdfIn PDF document text
    • http://agro-partner.com/Image/files/44569491592.pdfIn PDF document text
    • https://citronel.com/userfiles/files/taxexapimojanupagupakepu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d4de9bd0---72655199055.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/kovawuvibuzejinozanun.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/3223550761.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_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 17948 bytes
SHA-256: ed5fd5bc1064afa032b4400acdc7aa8b42f0ed9e6d2d76e6cab7a6afb307f99e
font_01_sfnt_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 10224 bytes
SHA-256: ada91709e6c7e0b46b7716852c78fd0707070f07c0d3e45b1bf98e38de932c70