Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed727a8a7a53b1d6…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 03:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ec3e54811bd23c206c7afbad4ae57cb SHA-1: 95e7263c937fe63d60a3347ce6680735e5ee8e20 SHA-256: ed727a8a7a53b1d644873ee9becc36a9adc35aa5be398d28ff5c1d3dcd928307
156 Risk Score

Malware Insights

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

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 embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=losing+weight+on+1300+calories+a+day
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8496f8ee86ab5fb060aba80f7bb19d5e/56901376966.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9848871f6eca9a834f3b80955e10564d/vusujikotiwem.pdf
    • https://wodepcb.cn/uploadfiles/files/fifowo.pdf
    • http://moda-minulosti.cz/docs/momin/file/mifaxu.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/adc04d3ea634d2cc51a86160e836392d/44689045564.pdf
    • http://aitrans.cn/UploadFile/file/F1202106240426583020.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5a80e670b281f83c3cc3ac0eee54f5bf/reduvibobipanaxefa.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0e2b022a6e862873a0515fe1307ff9c3/35767516451.pdf
    • https://elektrona.cz/files/file/93860077866.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/vazotifibajovor.pdf
    • http://filtrydokoparek.pl/img/all/79279546684.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7pr5ld418q6gtcu1rapb63v1m0/wimumaxirovivuvanorov.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac348ae83ed---83507232079.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb0aad1d0---95021313744.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/idsu3iepp6uhpbufhsuj76sdss/xixupebalowajikatijum.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/7809252171.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e5da9b44a---78549848218.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ff0fda99f4101db9478f05cda4c953bd/80876507427.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a369472a6b5---39197946156.pdf
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/dojenujapinafagoxegozizit.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a01c84b49---99812043488.pdf
    • http://ajtoablakcentrum.com/_user/file/23738110471.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/eac54ea7bd5ee8187d335f0fda3367c6/62244257361.pdf
    • https://tecnicadovolante.com/images/file/gewusejumi.pdf
    • 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_off0000f4a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 16792 bytes
font_01_sfnt_off00010cb8.bin
dbce994d2d43d5709b8f1206fb751c1e0c35c21604918621af0291626f648b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 16896 bytes
font_02_sfnt_off000138bc.bin
e36926c4076b27d1d6933d58bd21697a26e5c53a6f2ca08c05d29bef1640fc9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 11152 bytes