Malicious PDF — malware analysis report

Static analysis result for SHA-256 2002fc43bdf4a09f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 04:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 315eec562e7ccc6226f094debb8ec37c SHA-1: 230235c60063e9031c56d3319b78967aaf947839 SHA-256: 2002fc43bdf4a09fa1e0e77bfe3e843c00234850c84ede5269fbb969c5115bc5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to compromised CMS upload directories and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/855c655894e4422f0b460c5424888ce6/gukag.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/virosipubebuxuniw.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/2544206027.pdfIn PDF document text
    • https://mmszke.hu/files/file/gupadesipabede.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/ziduvumezogeved.pdfIn PDF document text
    • https://equimat-cheval.fr/file/lutopawobinub.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161127d53f4180---95475408511.pdfIn PDF document text
    • http://amandamaitland.com/images/file/mopigo.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/97463063175.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/6f2cd25298b32a890bc0194aa4deea37/73030298423.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/valediwifevivupa.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/kazimupakakoganowex.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/55500874876.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210809_72FF6E76EFEDB517.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/zenira.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/96873556297.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc070c08fc5---38596202801.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/38730073289.pdfIn PDF document text
    • https://mfdesign.hu/files/file/rekaxeguzazumilafenob.pdfIn PDF document text
    • http://planetamama.ru/files/file/98190410206.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/snfgoohcik9706q0oldi5rs6ls/80381900282.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5ad8ea9dd---refevanovamivudi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161061963010fe---98183233283.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cd4ab77d2---xagijasuwe.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737807eee89---pamazasedurusakexubogu.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/90548870755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=arithmetic+formulas+in+telugu+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_off0000bab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB4 16104 bytes
SHA-256: 70f88c4a10e73a209a1838b4565981a37e2ef6d3723cce358060dff03c332a25
font_01_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 11148 bytes
SHA-256: 86ea319b71b54e6ac2e5baab1f6d5437d6381f7ca51f2514732e0bc5956c9d13
font_02_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1