Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d139e132e9f505e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 15:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27d4ae68e4225243838a114568e4f013 SHA-1: 2abe572e0716f9588adb4fc55fd1a7c1c0c55efc SHA-256: 1d139e132e9f505e137f995b31a2fb02c08a453025429c8a821a03071b34b7b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of external URIs and compromised CMS uploads suggests an attempt to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a63e34b6a---32724239315.pdf In PDF document text
    • https://adsbudget.net/userfiles/file/6644952810.pdfIn PDF document text
    • https://ccskin.com/geektic/files/86370642516.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b95d29c57f---navedizopovavoxiziwepibuj.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/32963833688.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161378789c1fda---83740961961.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/gukovarovinazutukud.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zipig.pdfIn PDF document text
    • http://zuszdounky.cz/files/fowodegadusi.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/95199140081.pdfIn PDF document text
    • https://togeltop.net/contents/files/17999629733.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/sipekamotuwoti.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/31178558545.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/vezinadibuzunev.pdfIn PDF document text
    • http://zeci.nl/im/image/guvopejiniseral.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/kadowisekoreze.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/35999863770.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/wigenawiviremed.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/bowefivirix.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132847e02bfc---fofamilebotew.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/kelizibuk.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/56560458670.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613078c15558d---zarajinijapafawoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=create+a+group+text+on+androidPDF 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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 18240 bytes
SHA-256: 6cc9e25c87af7cb77262fffe075f97930588020793b8b96e55789535409ebc55
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 10584 bytes
SHA-256: de4f494875fa679e740638c978b56844b923ebc6c540c21a0233f966038cc965

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