Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c2432d3e82b12c…

MALICIOUS

PDF

95.7 KB Created: 2021-07-16 04:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 566f2933e59c7253639773f04d2ae23c SHA-1: 91daca58e43a963aaa32c4f97b11fcaa9c35e078 SHA-256: c9c2432d3e82b12c5bdb0b715728813e5fa51368a48343b480053b9fa49370e9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress uploads and disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The embedded URLs suggest an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=how+do+you+find+the+greatest+common+factor+of+two+numbers PDF link annotation
    • http://albatrossmrn.com/konadnew/userfiles/file/69535901162.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6p9be7ch5dtnac6721t2rrvao5/letitamofewezibiwulawep.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/gabizukob.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f656b7008a---43012700340.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b7ad9799---53869135630.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/jejin.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/26921725810.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093596f0c8c8---vanezuduramezirulixirom.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8aa1b67ed5---30461608507.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae72e328e---wovositerew.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5162b8e1---36667863675.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/6759803071.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/u44jtd1ehu5k4b4j9b72rb31g6/32770852706.pdfIn PDF document text
    • http://aimic.com/userfiles/file/29969323579.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/waludibenobebevuz.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/93i8vmmsi2fjmplpm6ic0hbjf3/52784894339.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/witofari.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gt0rcoib3vo8rbhieg048qvves/62488770337.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/900cfb9f481d8ae00dbe5762890f62fc/18105746048.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1b69fc76aad53f624aeb321f15dbc0f2/darajugina.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/masisoguvilokotelom.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a2cef4c73ee983671fe1c1d91b0ce57d/jumanumewakiwu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ua1e3vk8veplneqaks102dmshu/24630900542.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd556b543---74801312816.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/438f908a4d2360230799f58d4f5165fe/negigiliziwuwolog.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_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 17044 bytes
SHA-256: e896186a13fba33915e3439c4c0e499f540e47ec9b4b1c223b469d86154d4b5c
font_01_sfnt_off00013c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C74 11308 bytes
SHA-256: 42d75cf94569c150e9c5e20aa537b994959e85b187b9f65ad1cee378ba3c141e
font_02_sfnt_off000156ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1