Malicious PDF — malware analysis report

Static analysis result for SHA-256 136a587455fa7a02…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 23:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c94727876193d5efdb237bed5122dddf SHA-1: 7ff6eaeb5e839bcd6f9de8a9aa5bb658d1763359 SHA-256: 136a587455fa7a02dbe8f9ecd11247028d8cba50022f0d0ebe27e8e3949e886f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous links to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or exploits, indicating a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d8acd051c9f8e337ab7b9d68bc9bce43/63061252030.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdfe784b72---voradawaxudemip.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8870393d9---98031072190.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/84812169415.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e5887f7c3b989b76c7711fedfc73e0e4/30439057069.pdf
    • http://valsadindustries.com/userfiles/file/35559274567.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/71ec6432a430c097bd9381123096ae6c/22251533512.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/31995608920.pdf
    • http://baohanhranghm.com/upload/img/files/41945228568.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b547d7b7---87709158332.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/f3f940bb6dcc36c492bf1ad950fbbc1c/buvek.pdf
    • http://self119.net/upload/userfiles/2021/06/files/210602135654.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607312ea6faf3---60455429323.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3986a800a6bad27aa9f39d4861d6bfe6/fetef.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4rj17ihbdqrtnmbu2ernl303bi/66001978521.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/36431551074.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/fdbfbd98ed8e3a85f077b5de3705b0db/95318325024.pdf
    • http://rideco.hu/upload/file/zowapumolojinewugemumo.pdf
    • http://parkhighclassof60.com/clients/871169/File/mosagawave.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=linkin+park+in+the+end+mellen+gi+remix+mp3+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc39.bin
2b38b3743bdefaf917639d2e1e475349416cb2837bc4865bc134e2eab66bd1da
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 18776 bytes
font_01_sfnt_off0000ea13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 16792 bytes
font_02_sfnt_off00010225.bin
e1e97f9f55f8fb8b1f3cf0a9432435e7f67ec1bc6306ca883d8df705d0382254
pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 21272 bytes
font_03_sfnt_off000134ee.bin
1ee65fdedff6435e17a68c95e56da0233472040f648a1e8d4681c2b2c4174597
pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 11080 bytes