Malicious PDF — malware analysis report

Static analysis result for SHA-256 a114b04a9b5b1a18…

MALICIOUS

PDF

110.5 KB Created: 2021-08-23 11:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b7b6e8896c0cf646148c2261bedfdf4 SHA-1: accb68c58697f1640d6fc453efdf36b2acea2fe9 SHA-256: a114b04a9b5b1a185ffef8d7ddaae099c0330544895363204cf709b6397f6765
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://media-get.ru/userfiles/files/gunogogivo.pdf In PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202181464924598.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/93c6ffe6f432a52fd77d73060370a6aa/rejakejila.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vmhe2hiohjbns2390n0mhe2nb8/givogapowedurodovasuxexes.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ac5bce4e---55665062480.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/zokepanojanadulo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824cbe87400---94390435507.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/vlv1cd16oecd2li7rp4shq8hrs/39672462978.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/beh5lffsdck87c255jjvqb7c2d/44135416375.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c5f87cc18f4fe96babebae7bb9f2a169/30693898043.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/23624226650.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/vumetejajevokisemusinunex.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/59509560878.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/96219671828.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/20804489620.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a3464074d4b5718a5f9d9da4d3c79295/45604048832.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e63776197---tobupisipizuvulafejotin.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/26754196407.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nuweboresutusapiwomopur.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/jezuzota.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/17184243148.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ad4552ce---9734446521.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818159acb36---dorinolasezejomepo.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/88858868776.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed5977ee---zenuv.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8ca6f133---46167975746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=types+of+titsPDF 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_off00014cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFE 18900 bytes
SHA-256: cd793c23c60be1ae53767204eacf8483dd3b46b6dbb7f192e4a5349d6219b62f
font_01_sfnt_off00017cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CBA 10016 bytes
SHA-256: b7840c88fdc0373c548b4558cae488d6e5c987ba7baa5c3746bd93564bcf494e
font_02_sfnt_off00019328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1