Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee82204f53f277cd…

MALICIOUS

PDF

77.5 KB Created: 2021-06-27 09:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd664f16b3e024b7ca9c6059673d387a SHA-1: 969fc1981a51e929de4ede894b2e6f7a27dbb9ee SHA-256: ee82204f53f277cdb01dd7544126e0fcfa2bf934afae9f06c22263010dfc3db7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085073bd576e---ziwebeweji.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852806ba67f---86261120202.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e6c9a8cb---99059969330.pdf
    • https://vipbeachhouse.com/uploads/editor/file/temipugebosiwuwerinowe.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/731c43da259c64536ccb9b2319ca84d4/puwulunanidugatiwinurasu.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828973e4331---mesiv.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096671fd0df4---3369736797.pdf
    • https://napraforgohotel.hu/upload/file/sinonodol.pdf
    • http://yuhenganquan.com/userfiles/file/20210618041518_106426912.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f44c0b29---39469996490.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071362ac1071---butipar.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2952c0e5ab---vikiwewufovo.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/57d52949c123108e81f61460254e3ebc/16146227340.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/livebebide.pdf
    • https://tort-art.ru/userfiles/file/doguvukoj.pdf
    • https://mn-lawfirm.com/box/userfiles/file/dupakabofebidoboxiba.pdf
    • http://sanarina.de/ckfinder/userfiles/files/16365325628.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e59554353---tozujide.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c120a9086fba05ab2272920698e01b0d/18921834352.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609866ceee7bb---78957939660.pdf
    • http://vzwsportenmuziek.com/content_docs/54628535235.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef029ce97---binumalonutapixurenij.pdf
    • https://anukulagrotech.com/userfiles/file/53416612250.pdf
    • http://bularz-auto.pl/images/userfiles/file/gesepazalinige.pdf
    • https://karinbentum.nl/uploads/file/26751379231.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=minty+code+2020
    • 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_off0000cd84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 16792 bytes
font_01_sfnt_off0000e596.bin
f145c5ff66e7daa227276cb285f4ffa62dc416656465e192faba4e7aa1dbf94c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 17252 bytes
font_02_sfnt_off0001121d.bin
f579a567e7f029c08426d6a3e116dbfebd2c4efe73185a46ff4a54597b7cfa4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10236 bytes