Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cb680c6096296f…

MALICIOUS

PDF

81.1 KB Created: 2021-06-28 03:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f2e1abbe3d53efa446ea9664bc01e15 SHA-1: e89f19bd8db1908d91493da8e07b9accc8a09f03 SHA-256: 56cb680c6096296f9e56f64e01eeed20bef2a31f5b31159f74c99bf93e00b346
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hainescentreasia.com/images/file/diridojip.pdf
    • https://baxsporthorses.nl/userfiles/file/ruwidufuniba.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6f9250c8---fujud.pdf
    • https://baigiangtoanhoc.com/upload/files/2873093029.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/fizomenanosez.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c3037b57---tafafoparuboj.pdf
    • http://silesiacapital.eu/data/file/40678614963.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9ujk54lb3of07uadvrik9fttjc/63218044514.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/aucv78vskm9i1ur9l3qfej1r89/tasubelitub.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3a40aecb655e73e9e5e8b659f7563589/mukegeva.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/26647534310.pdf
    • https://eravukappalpalli.com/userfiles/file/petizirowugodoj.pdf
    • http://royalwedding.jp/images/blog//file/42611856672.pdf
    • http://homeopathyhongkong.cn/files/67320053330.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/q8eh0vhphdtavcc8j8nk2jevl4/64350360539.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d79cb20c3---gajakexusaropibemi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6hpd7ccurb9437ptl1gnvodgu2/vinepalisefijim.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8cf0e2afda8cc12846609d9292309388/gupinudi.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160703818b82ba---18901237803.pdf
    • http://baohanhranghm.com/upload/img/files/dimobazanowobabi.pdf
    • http://fitviewer.biz/files/file/zagamowudivozofibudime.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce53c7427---retifan.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/26b6aed90be90397eb723099ce3d8d04/22422079743.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7opn7tc9shd95ngt9hfbsu4sdu/63061161814.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160905c50dcb5c---13842079841.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ansonia+ct+tax+collector
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8a.bin
82c616bb76eb42699bad0a04b3040b6e13a25c7955a79c1d30a579c6c78f2a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 10308 bytes
font_01_sfnt_off0000f2fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16792 bytes
font_02_sfnt_off00010b10.bin
c711fa68fb91b500c7e9309268cf8723e0b6fe09a06ca6e57ba639fa6faebfc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 16896 bytes