Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f7c1b4af14ad45…

MALICIOUS

PDF

109.1 KB Created: 2021-09-08 07:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b2c80a1b9252e401efe28f70546c241 SHA-1: 536c8a908f966fe8c375177c90acedecf3a707db SHA-256: c1f7c1b4af14ad450d7c24b87e1b548241c10c53cc4e97fece31676b4d1f539e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests the file is intended to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://pistant.ru/uplcv?utm_term=banking+diploma+books+pdf+free+download
    • http://gdlianyu.com/uploadfiles/file/zetalutaripiruwularire.pdf
    • http://velocimapper.com/webfiles/file/13567223107.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/jotud086qe6cqk2ve8ulpc9dbi/70615176274.pdf
    • http://corising.info/sa_upload/userfiles/file/20210815193215.pdf
    • http://studiotecnicolamanna.com/userfiles/files/fovegefuwekefefenaluziz.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/932dc52b0c6dd77ee0c44cf8f8ff5487/zopugutawabemilezu.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p65koqef62gtsgll8t1frj93kj/88652943986.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/70dec76bd9beb305d39558880d18091c/guduborajalef.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/8c8292f30f5093ccbce473409498a349/jinepikul.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/514e3517051611979a714444972bbe14/xuwipuzugisovumunexe.pdf
    • http://dent-pro.cz/pic/file/vufazupasusipawed.pdf
    • http://applecentervn.com/uploads/image/files/zekojamovinaronejaga.pdf
    • http://yesfabric.com/images/upload/File/vifazavaxin.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842bd873df6---vibaxigiweginukurozej.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/46af65ae67752257a0d437c96d68152d/66111314119.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da8e5537b0---samutomexafepeluruzirip.pdf
    • http://101-games.ru/images/uploads/files/zanekokosiwerowedinejur.pdf
    • http://acunambalaj.com/adenoto/upload/files/45551816537.pdf
    • http://arebiatours.com/uploads/files/23644581092.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/44921a556222cc064a7fad3521b9767d/kigolaxejizobiso.pdf
    • http://exima.kr/userData/board/file/newazikojejalodilo.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/307048df4d97141da16380e0b085395f/pitomiza.pdf
    • https://e-midas.ro/files/file/nekupali.pdf
    • http://chobacgiang.net/webroot/img/files/larovivijeji.pdf
    • http://a-kamen.com/userfiles/file/50786143338.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001192d.bin
7c522254ab9f9c0dc4f05083bf53e2074d79825cce473cbc49aa8e328d02e074
pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 11112 bytes
font_01_sfnt_off000132ad.bin
0f717a75a19c6de39b0543e89ca9a6d63eef82b664883db0e7b5c6f0b0a4b7b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 16264 bytes
font_02_sfnt_off000148c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148C0 16792 bytes
font_03_sfnt_off000160d2.bin
6350a107123e17cb78688d79c27548f3935b83864d6cc2b40cf94e03f1fedf10
pdf-font-stream PDF embedded font (sfnt) at offset 0x160D2 22816 bytes
font_04_sfnt_off00019c2a.bin
c5d3edbb5f616b3ca7735a2a4407ac9f7f034d1570fbe5ab8806e8329baaecab
pdf-font-stream PDF embedded font (sfnt) at offset 0x19C2A 1948 bytes