Malicious PDF — malware analysis report

Static analysis result for SHA-256 409c698e81153f45…

MALICIOUS

PDF

91.7 KB Created: 2021-08-12 21:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c43d26ba1a6bfb221820fa0f54f8c36 SHA-1: 5d9fe28048f484508feb9c9d0727a29d1b8e71d7 SHA-256: 409c698e81153f45e7b03dc0f452072b75e0df113017b60fc9630d71ab5ffe84
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a "download button" heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fifuji.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cd043b25d3e2733d400ee1c355fa6f04/gisivipuruzotepifiz.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/getilu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/61e586066fe7c36a3f5d7737ce3b0b02/tubebixemexam.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c03d87035---mowek.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/11ab3adf0d770d464882195a606bc959/48204475161.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mq7pn5h2s18kg3vleo5m34u1vq/35389831436.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080174898eba---16345164647.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873c471b62f---81264567657.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4b785412de09b940998fa46555b725f1/65064740478.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5fa72a32cc721effead4eee7f02e0ca0/72126201806.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/potelobedupivoletubu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5975ac546a959cd23b7e2ca0bb2fe26e/60567033064.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6285cb55b---54088225561.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc02d2beb9f---topekurafasuzo.pdfIn PDF document text
    • https://peterdegendt.be/file/naxatobuvepune.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/zatifakufisazajimatorogep.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/31705404339.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/62319773401.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/91634799657.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/rewegemibofubofituzogipul.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d946b4a2bc---jokaju.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ebe909c0a1007113087345f7e426d623/palejib.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dd73f374033---33113738541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cara+download+corel+draw+x4+64+bitPDF 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_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10800 bytes
SHA-256: ca00b261e05bca88b07d781f6f34db8a2bd5033dcfa189373a8abb1edd5ef541
font_01_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 17056 bytes
SHA-256: 50c4d340734415827577f19a289aa80f9a0bff4fc867d13883b90cf78a4dda91
font_02_sfnt_off0001489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1