Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec67f9253b76089…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 10:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3235a4e1a529df706da623d9c915b2e3 SHA-1: 846dbd079b37be3dcc7ad50a0d8daf348bedf36c SHA-256: 0ec67f9253b7608970fa9bbb8b9947c49d9368400e7f3d5b8dabff5456e7797f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's designed to redirect users to malicious content. The primary function appears to be a link farm, likely leading to further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kimhoatra.vn/upload/fckimagesfile/nalaxa.pdf
    • https://minjar.mebel18.com/uploads/files/90491561013.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/29659293984.pdf
    • http://clean-ecology.com/Upload/files/lutupewafivo.pdf
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/wirem.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161395a0477a0e---gitunemovag.pdf
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/zuwuzibumozidimopovabosex.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ace97915---7898702969.pdf
    • https://mk-sito.it/uploads/file/93326523185.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161381dbe1d2ab---97877924167.pdf
    • http://ganteltechnology.com/system/userfiles/file/dakifakojabulepaxemub.pdf
    • https://www.profiemg.cz/upload/ck/files/wijupegigedamaruri.pdf
    • http://boldogelet.hu/media/tuzuma.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/tevegupufesuv.pdf
    • http://clean-ecology.com/Upload/files/godiwit.pdf
    • http://gediklimakinahidrolik.com/resimler/files/73359928835.pdf
    • http://ancheng-medical.com/uploadfile/files/xinilopigot.pdf
    • https://istanajp.com/contents/files/55760568593.pdf
    • https://andhimazhai.com/images/files/4771659887.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/wutetujikeluwazifujuxu.pdf
    • http://bayanairag.com/uploads/userfiles/files/4102597963.pdf
    • http://hzdsbg.cn/uploadfile/1630518472.pdf
    • https://goodline.by/userfiles/file/bafajujuloxofofasitun.pdf
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/wujevugiw.pdf
    • http://carrozzeriardue.it/userfiles/files/lerebizupoxit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=traktor+pro+2+free+download+mac
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c598.bin
a6f4879df9650cf2b2f7fd43684911f65abad1ae479c3fef15742a4e8421d77f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 17940 bytes
font_01_sfnt_off0000f3d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16792 bytes
font_02_sfnt_off00010bee.bin
95320225d9338417f9ad5da78b75c39e2ba7ecc3ac2ca342f0e33735595b8b7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 10784 bytes