Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba79af3162209203…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 10:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 68b0a5c247b64db1e258fa394e104901 SHA-1: 468fa3f958879f52e8c52be2fcff7745168548a3 SHA-256: ba79af3162209203f8ba5236bd66323b503ddff94fbd7bb871a9f63637e91f1d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://anhuizpyy.com/upload_fck/file/2021-9-2/20210902133604833675.pdf In PDF document text
    • http://videofilm-tv.ru/content/File/15542413072.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/kusowuvefanuzipipi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcad47273b---93504055810.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/50798078291.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/5178523605.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/9032413566.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d1bfd52e33afc56a5443b0be4a565e03/zepagetadaregijodava.pdfIn PDF document text
    • http://indemo.pl/Image/files/dirunaso.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/faxobuxetaf.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/zewevupagapuzaxi.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210903222310.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/lezefurojamijigomit.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/78315245942.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161359ef78b653---63938957542.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/tejuzo.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/gukul.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/19226769297.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210917154309_wxmx9d.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/55553406086.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/siliwofanivu.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/64978541670.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/vagivipepowo.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/toguwapezumijezesupelazix.pdfIn PDF document text
    • http://unityproductions.com/upload/files/13785318929.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6bb26ca85---12712317620.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/13331267185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ml+skin+hack+no+ban+apkPDF link annotation
    • 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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 18448 bytes
SHA-256: 52a6de370947abeb4186300c035b9fe77054cbcaa694aa650d273dae72d2c45b
font_01_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 10368 bytes
SHA-256: 1a195b2a1fd654adfdbe6e9aa89552785885c6e09b5378c880780414af698634
font_02_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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