Malicious PDF — malware analysis report

Static analysis result for SHA-256 914a1f3274f27a9b…

MALICIOUS

PDF

92.3 KB Created: 2021-08-14 23:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afd0f3e1ae7af4926fbc45ccf499507e SHA-1: f3ffa6798617ae15e999f542f4de4c79b4d19391 SHA-256: 914a1f3274f27a9b49957c0789686cb9c71430c278c2f396ba8b0b21836c521b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links to external resources, many hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://pistant.ru/uplcv?utm_term=laundry+business+proposal+letter+pdf PDF link annotation
    • https://myshalewell.com/userfiles/file/bepibubataponoripexusekuz.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/79553046476.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6a2b080a586bae7769d6400631100bf4/silegofunawudipiwirove.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/76511846596.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/xanexegivekesovogigidujo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50fd94c16c---xelexerewotoxijefo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1f6365a0---83264780397.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/xililepisepakabir.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/17167841426.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c9cefd8f239e0fbfe72d51a68e4f6268/mijigidamawogixizi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd7e812---zemozor.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab9b62776---zugudoxodejewatixeturiru.pdfIn PDF document text
    • https://areicon.com/images/file/4295077269.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/69776134972.pdfIn PDF document text
    • https://daismene.it/file/muxataderiwijupe.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/kenuranavotanivovenuki.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/38688045026.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f8b875b55---xivesajo.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/82fca0bbc479f46046593f17f881e3cd/jilefis.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160908eb450a7c---sitezapoxeveke.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49485bd5c---boturaforipizosowukuw.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/wulonapixaxulokisuwajana.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0dadf26d---9901223082.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607735e81a33e---kebafipapegapotubuw.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/vireboxusugagebagufe.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_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 18196 bytes
SHA-256: 0eef39f8e32cde87296dd844ab0ae78d27484d4e1cbd8bc3dcf15bdf9bc5c011
font_01_sfnt_off00013181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14998 10804 bytes
SHA-256: 28cc772000d64f3865401dea8ec326d638d8f8ff92c2a988b05c1590c8dbbf17

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