Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f76fb80a54411b4…

MALICIOUS

PDF

91.6 KB Created: 2021-09-20 03:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90758d39a0cd3e286ec44de96dffa60e SHA-1: 59f7328b18d6bc58e0ccf5b83581a50be436816c SHA-256: 9f76fb80a54411b49ff6cbfab402e15ee97aafebe31c5507709b924daa1fc230
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=valid+credit+card+generator+2020 PDF link annotation
    • https://imagebuzz.net/ckfinder/userfiles/files/vomatusuwotil.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/rilunuporaf.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726dd4f43e---zanazudurusotilexizof.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/62437763611.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/tugiramidigo.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/99943402238.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/81274293934.pdfIn PDF document text
    • https://inks.bg/userfiles/file/85719532739.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/zikisozogerubigepowize.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/zubalurutiforunewarav.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/xosakuxibuxojunumu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614296e9e2f91---70219619466.pdfIn PDF document text
    • https://digicpictures.com/downloads/fadaxiw.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/99324422611.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/3532836511.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/24735185332.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613719c55bcfd---zoxiziroroliderexozek.pdfIn PDF document text
    • https://steammining.com/userfiles/file/29227636551.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/11031947412.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/99692816836.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/nusodakotipowedewuweme.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210915/files/20210915140539.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/76110731504.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/7384253169.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_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 10588 bytes
SHA-256: 65068bd44c1be65cae45555970ff1ccb8e5f150adb7efac0099dd2fef15436f8
font_01_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 17116 bytes
SHA-256: f5d22784aa9de6ed08e56c0d27d2fec07c08e40a1161c775a24bb89f37067367
font_02_sfnt_off0001484f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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