Malicious PDF — malware analysis report

Static analysis result for SHA-256 501de58005807052…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 20:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5920c2e9bfba5d1a612628026ca78fa6 SHA-1: b909f122c48bae1ea245bdbe56f059232da2e6b2 SHA-256: 501de58005807052d43de8b6b7387ebe6a5e461dc17adcc47e4cd448b455458a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URIs, many pointing to disposable hosting or compromised CMS uploads, forming a link farm. This suggests the PDF's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=add+cinema+on+firestick PDF link annotation
    • http://j-line.ca/fck_upload/file/boniravivuzukivep.pdfIn PDF document text
    • http://fittbikese.hu/files/file/94326602180.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/wusurad.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/53066876520.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/tefobonedirowar.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/10022404960.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613581981ba5d---pamas.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/40450850868.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/d74c6e8805b9021658fe3a59878e0989/fonevojikev.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2540800BA9E92B45.pdfIn PDF document text
    • https://termofriz.rs/files/94277420778.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/getuletenime.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f4e592e893dbfb88efe6e507dde46294/jopuj.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/pujume.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/xavinebek.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/katili.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/direm.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614176b637d8b---tuzizowewelamezowamilisun.pdfIn PDF document text
    • https://teamcode.net/upload/files/xeginuboliropozurif.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/53822459874.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/faseju.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/degigevabelub.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/31103646.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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 10664 bytes
SHA-256: d860d11c72e2377f4e4c06df274b89eeff3ad62baca793b9e7260825da3dbb20
font_02_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 15136 bytes
SHA-256: 840f0769e6b9a25669f520f6ff209d3b3cd4eb1b1c7f68c25bab7aaf8d4e1bcd

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