Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2e51ed6d4fee09…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 08:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0194b6b21b3454f55e95724741e8518e SHA-1: 7dfb1212966d4beef277ce0f704b274b1e69f5db SHA-256: ac2e51ed6d4fee0900ddaa5ac4f392a0b54b1fc792f568f163b1394e879efebb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. These sites likely host further malicious content or redirect to phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c9dq1iabjft7hmhahrirjpvf6j/dutiwuxuki.pdf In PDF document text
    • http://hphs1958reunion.com/clients/47465/File/kefotozaju.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/bubobivazolewifonesefupij.pdfIn PDF document text
    • https://tadimtursu.com/image/files/wosakebolenef.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a310a3ba93f---soxogobiwosorezufero.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mupesatazija.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/61p70ut32bsjdobcvjkc640ajc/90055837168.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b17ce62099246579f52e2f5dc2c33735/78160007233.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/45417412798.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12f8f0cd9---44898110524.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/zulidupojedimezadopebiso.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/bidulirebe.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/38059005772.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160962fe80dbb8---motelumunijoxemaviponiwu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd8376ac42---56474516320.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xovofezazagijedusatede.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/41127947452.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/wubujukuloxafekajojenapa.pdfIn PDF document text
    • http://imaginove.eu/data/Files/siwetesijuba.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/70528637686.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/76541104497.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/91014042802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=software+licensing+definition+pdfPDF link annotation
    • 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_off0000ba7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7C 16464 bytes
SHA-256: 1c491515ee8f78041d4ed71b07634c7cf27cba3921e7165220c2f68ac98c9ad4
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 10956 bytes
SHA-256: bf2e4fc5905ec07d3460411808855bdfa84c8db4b391ae9a1c5f47fb27b42275
font_02_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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