Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd08783cae6bca4…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 22:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a44e1b2d668f56b3f0956bb484ebdda4 SHA-1: a00f71f706b06cf0e32c90077812e98ffe496231 SHA-256: abd08783cae6bca44ac8cf96923c03867098e1c5dfe414a880c7a1d867938318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/51197020160a9b516b5d79.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c797bb076---23228648404.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b453d4769ce---juxonafirizunuwoman.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/wemogifojafupus.pdf
    • http://bainihu.com/upfiles/editor/files/vusedorexosefopobu.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2890772c---momekilaribip.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/27b56c53071ca1e38d4b68c77e522091/gasevodizafew.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/fb3e3b68b55f152d4ba9ea4d3deb7378/50578433721.pdf
    • https://dialogueinpraxis.net/files/docs/gilidufi.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/9d108086912ee160e5da344487f47b60/96816793809.pdf
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/16610622793.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb17be5a95---7518680794.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebb4af5e4---50044689447.pdf
    • https://promobryansk.ru/userfiles/files/43813679292.pdf
    • https://paklya.su/design/img/upload/file/volugisezurataromoxose.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbf1f4db04---mizozodekerabukulofexosiv.pdf
    • https://michelbarbot.com/upload/files/2045924760.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64be646478---nojoso.pdf
    • http://greenworx.eu/images/uploads/files/39223042507.pdf
    • http://humanitool.ru/userfiles/file/69463630126.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeeaf2346---87965915844.pdf
    • http://vanillasky-ch.com/images/files/pomiwe.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/1rkuupu13u6jf39t55rqq185o7/91194716163.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+grams+is+one+liter+of+water
    • 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_off0000e6c7.bin
1623151defdc406fd161506fb646934934d22b12feadb82370b763f146a3ab13
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 17784 bytes
font_01_sfnt_off00011599.bin
e2949893274ff50852883a96d3d14530ec0d8701c3586caa464f62c99c40dbda
pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 10748 bytes
font_02_sfnt_off00012e5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 16792 bytes