Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3599da50218a51d…

MALICIOUS

PDF

91.3 KB Created: 2021-07-03 08:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bfaf7a0eace65ca9eaa96b17de3f8d09 SHA-1: 9688d29bd1750dc5b4b773486daf4654f407349a SHA-256: a3599da50218a51da8e9c581b68b03b78e5c35d86b8078aeb55f5cc7a1b18a84
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, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8c37d448---takavokovivupelutexe.pdf In PDF document text
    • http://kozelskadm.ru/files/uploads/files/94520368048.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/52698747858.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/iflblc2vridrhpspce6df439ns/97179131236.pdfIn PDF document text
    • https://soechi.id/userfiles/file/wofidedugapeg.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b6618583---69587731332.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b9756d0db487e93768fc5756238f4692/fikepelad.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/33456094220.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/pezizonevopeneninapigaw.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/75680613224.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qul7utg8dffk9d0fslmobgma26/rafufejiwelofinuz.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/84cb4930608aeaa860a3398ecd89110c/poremesabopuxegodom.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad749de1ed6---47715963849.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/53870751716.pdfIn PDF document text
    • http://usmleworkout.com/files/file/64059816653.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160718654a90e0---dodajijuwuxojaruveruwukef.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e98568061---jagukogubewun.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/20525400535.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6394b9847f---wunebugifefarumozol.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210619131929.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3fd38264bd818ff8bd4be517a2aaa13/pupipiwaj.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89ef16a874b61e14a30a398f92ee5d16/681488063.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/228glbjbnu88aq2jtq7lt896ua/jawadaxupa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/37dec206c2e56ddf6cdbc5046a2c7263/64378188528.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/t5moldi413nanes9hgq08ir3kj/fodofit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=things+you+can+sue+a+company+forPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10960 bytes
SHA-256: ae9692af967d32bd9cf6e001d1da9186a94575c681b1fa361a6dfc982f4cc714
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 17388 bytes
SHA-256: cac45a1977c46c096d56ed39dcf11eb4d0a0b194605ebccd05c21c33df895062
font_03_sfnt_off0001470e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1