Malicious PDF — malware analysis report

Static analysis result for SHA-256 658f124453ff858d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 03:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bf8717dd494bf5f8edfab18eca1c332 SHA-1: ddc751ceecef41763b1ab702cfcd87f0c2f2ff64 SHA-256: 658f124453ff858d3b1287c85fc1f05d376d59c7febea6c2400c372bcfb882d3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself appears to be a link farm, likely intended to facilitate initial access through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c839c7edf---86129417430.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/63a86ccfe4659f2be7bdb84845ba986c/jorusomex.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160728e0a890ec---difitaju.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/79995814519.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/eul40r92d4k37aaksjt8uqjnm1/wijige.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/namifulorikevigamisibagab.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072bcd3cf26d---39517805236.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/21908053828.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607431f449aaa---sabonofazusepukenaxux.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/ditofekubato.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083e26e9ba9c---mafoditefo.pdfIn PDF document text
    • https://adci.vn/data/upload/file/27525037813.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/xufogajukodujufamur.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/92564998256.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/2um6vgs8dvd7jknrcdmtia9ou7/15446734260.pdfIn PDF document text
    • http://darstin.com/userfiles/files/zogejikinamune.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/neluzani.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab6abf45e---gesaxuretajekorewojezov.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/tevufaw.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddf8d0e5a---vitosoxudedoza.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/68353612907.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/81c618f3adc2b67c59b060c788063b3b/36154242541.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/34857123746.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740b43349c3---85043923468.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/pivefinonupore.pdfIn PDF document text
    • http://orderkai.com/uploads/files/sososejetavali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=forex+trading+strategies+for+beginners+step+by+step+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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 16976 bytes
SHA-256: ab77a4532971e24b58318350fd47d46539dbb57ec0f09b05caa4ee7eb591e0db
font_01_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 10960 bytes
SHA-256: aeb1cfb8dbfbe8d357dea4270c87f8c54714f1b3b03352200db78ef6f0a017bf
font_02_sfnt_off000125a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1