Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ec7c9b7863c67c…

MALICIOUS

PDF

80.7 KB Created: 2021-06-29 01:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0492a7990f400f6cdfb1f1bcb05e3c9b SHA-1: 6c2e2897e4eac068e26e4b7b6b81deb13d57e1df SHA-256: 88ec7c9b7863c67cccb0c5e0d9feaef6c405462a3c53ac905144687b249634a5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains numerous external URIs and links to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The presence of multiple link farms on disposable hosting further supports its role as a distribution point for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://garglob.ru/uplcv?utm_term=pinoy+movies+online+2019
    • http://aqbnb.com/uploadfile/file/42528651107.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/cc184e584c795215790f193b4e3f5c7d/pawebifituvol.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d268166c0---52566557535.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbbf0c5c0---zixejal.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6b01cd43cb53d5c7e80eeee5443b5fcc/55071093241.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7e89749e---62951279789.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v9k8g5phhha49i2qjriofopp51/segavirepanaso.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851509f2310---filedi.pdf
    • http://morgancountyoh.com/userimages/siwajosigizuvajali.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fddca8e99435a914b6ab488ac7522a43/gowal.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d603a8508492ca895736301fec466a3b/ralizu.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/be06383f0c3bfda14172a7e8789e70a5/52711344683.pdf
    • http://archinfo.ru/uploads/file/11929295303.pdf
    • https://radmangroup-ye.com/rgfiles/file/vorulanewiwujevowenorekep.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf9a83fd0---verekakesiwudazipek.pdf
    • http://bukharaatlanta.com/sites/default/files/file/nokudumuzudo.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fbgj5eq6bd60lqesu5arqg7vk6/jivubipeses.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/646362f3b05ea9498e8c267724d695a3/99902825926.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607106f153e40---51091744489.pdf
    • https://travelstore.tn/userfiles/file/zikewujolefo.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/oev7l5ktrrj1smu7p7lds4eiig/mivalimamomuvodoxib.pdf
    • https://x-software.cz/data/file/dipanugowiza.pdf
    • 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_off0000d9c1.bin
033fc0b88526d1fc03f5c569e69b61778f1c7a8b20e4bf41bc645ab37de7c938
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 10552 bytes
font_01_sfnt_off0000f1e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 16792 bytes
font_02_sfnt_off000109f6.bin
263242cc02fc020efb064789691fec693ef936ac616ba66e6bbae70a23881298
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 16948 bytes