Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58a27cc9af18873…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 01:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30008b6ad462b6f61c182f36c3435eb0 SHA-1: efcce1bfd086f10dad82ca076e34f338a7221d01 SHA-256: f58a27cc9af1887334921744fea8e8a6a4a8581de1856c2396357cfddb18ce17
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=convert+jpg+files+into+1+pdf+file PDF link annotation
    • https://cingenito.ca/upload/editor/file/wowesemaxuniruv.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/ketetegepawe.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/ladaraxozudebunak.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d957f9a140d271f6218e04a2e1fe98a0/12048642013.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d18227007e636613ceca92a9762b25f3/jokuvumepufinili.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d69b2beb7---dajefadarolupevujupu.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/81640740745.pdfIn PDF document text
    • https://triosms.com/userfiles/file/zuxepifexofomosomu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0cdc0d5a---jevakij.pdfIn PDF document text
    • http://holzbau-napetschnig.at/naliloz.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/wonev.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gujanafinewurivowop.pdfIn PDF document text
    • http://charivne.info/images/file/miwobafedore.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/93337977155.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3355c421---sepejomejemekuxifukoju.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/30153491300.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/25500547799.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/54393299225.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099dabc37188---15749897592.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/16727698588.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736679b853f---96903788065.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/amhpnm4l79lisj6ipu46kgifc3/lizuzuxiraku.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/07fe2eee783d9f698d3e76f78f7514e0/xivamimazikufag.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/nafugipozemikelasumogem.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2k7daqiusdbr0ekgh79tqtk4fj/nuwenoketoredab.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 16372 bytes
SHA-256: 164021dad3d9572a2428e5995bceca40ef266f577ad7503bff8894766c5e521d
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 10792 bytes
SHA-256: 29dc416c8e427a40dfa390ff08fecc8da0676b7a02b66b754e6eddb617b80e04
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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