Malicious PDF — malware analysis report

Static analysis result for SHA-256 b615ceab8b5aa4b8…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 13:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3f7ce79f87562222c2db9b8a9586c39 SHA-1: 32d00012022957c14179c91ee1d76f717728d6c1 SHA-256: b615ceab8b5aa4b86e94bd61961207f1bc7a3cb3f6937cd65ac3c5ac30b42f7b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for SEO poisoning or to distribute further malware. The embedded URLs and the PDF structure suggest an attempt to exploit vulnerabilities or trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e94b87c---99976207363.pdf
    • http://powerfalcon.net/uppic/files/88844490973.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/stbflf1n6diqq6bdu4joruk7v2/degipulesovipejafenara.pdf
    • http://mp-journal.com/media/file/welazeti.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5991870ada---20618200161.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/28566184133.pdf
    • https://edinburghpools.com/contents//files/mizezazag.pdf
    • https://nakshistudio.com/ckfinder/userfiles/files/45953311430.pdf
    • http://gamjagolla.com/uploads/files/pewolibarifuwenobexuki.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/3e78b8462d63448ca1f1ad848f440ffa/32160362924.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d712e8e57a---86797146645.pdf
    • http://bluecars.pl/userfiles/file/bagusibutomupi.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a40rtq93m9kujut45lijmp5324/wiburadeji.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/64e411c5adcee0f716e8a76a29560ba9/mitupogirekozowelebodoz.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a2f19821e50ed491ac3931b8254e7dc1/jilegajuzonidexe.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609172f4c9e3e---jotule.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ac12d873ecc597c412809025db4b7cf5/34718219147.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161302df3d786d---zaxovatuzojiwos.pdf
    • https://anukulagrotech.com/userfiles/file/94812023960.pdf
    • http://ashioke.com/images/library/File/39994162633.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/s6iv0f1btedc4m84588k6cbit1/tuxituno.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=factoring+trinomial+expressions+worksheet
    • 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_off0000bb00.bin
0fc95af4882e983f5a4030239301aa0264ab10fc3295661550300abaee235934
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB00 11080 bytes
font_01_sfnt_off0000d4b5.bin
ca324ff8efc2a9fdc8ad845ed2677bfe6fc4b52754a5422335432bad9db12449
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 16448 bytes
font_02_sfnt_off0000feda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 16792 bytes