Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d70260765f02ad…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 16:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9666c489eac8d2a3d9df3a303ef6c26d SHA-1: 76d01ec5618b0a762fb138ac2192a41ea04a18c5 SHA-256: 58d70260765f02ad8aec3fa80a9cdbdc5488a76b068d10c39e5bb8a51d9a853a
164 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains multiple links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ccfd40eb---risutajuvimimobilomi.pdf
    • http://avanti.pl/userfiles/file/82476189324.pdf
    • http://bimbrlata.cz/UserFiles/File/vuwuxupo.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8ccc0097fd08903189aa5497e811dba0/2061781492.pdf
    • http://taaltoetsvo.nl/userfiles/file/40773975533.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/3698044370.pdf
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/pofemudezawokuxedixat.pdf
    • http://flamefitnessstudio.com/cewit/images/file/21633273024.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/48083939449.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed83814a2c---9774382051.pdf
    • http://www.nbc.com.vn/ckfinder/userfiles/files/vonugoruwol.pdf
    • https://bankubezpieczen.pl/userfiles/file/fekiredatomegoj.pdf
    • http://divapharma.com/uploaded/file/niwusafifodu.pdf
    • https://youxsoft.com/uploads/files/92894256439.pdf
    • https://classconnbio.com/img-jacson/files/dizadamijokuwozelonop.pdf
    • http://fishingas.com/userfiles/file/47711019071.pdf
    • http://perfectsextherapy.com/public_html/userfiles/file/56206544104.pdf
    • https://andhimazhai.com/images/files/zarafo.pdf
    • http://veterinariacasettamattei.it/userfiles/files/44091565504.pdf
    • http://qataminational.com/uploaded_files/userfiles/files/giloxezuzomajesoga.pdf
    • http://constantemail.com/userfiles/file/163072064649149731293.pdf
    • http://houselandia.ru/files/xutexegoranilosigebepas.pdf
    • http://jenan.com/ckfinder/userfiles/files/50233778709.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424a0bd8ae9---fabewe.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b0ec847c---mudireruzogunapes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+hollywood+movies+online+for+free+without+downloading
    • 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_off0000d9d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 16792 bytes
font_01_sfnt_off0000f1ec.bin
625c428c3cc3b48d06de097335f592355511ff4c8de4cf327f4187764799a4b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 11284 bytes
font_02_sfnt_off00010c1d.bin
5b51636d77fdf95e7972ce2f01bdcd6cd46515b5cec956150c9e01a82755f9a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 18228 bytes