Malicious PDF — malware analysis report

Static analysis result for SHA-256 440b4cfe5652a033…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 12:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6b9890bc5eb00129ed4e1cca81a4090 SHA-1: dd9f2cd9ff85d07fc9af36f5fb5f7e646cbf2b48 SHA-256: 440b4cfe5652a0332b142d37a59013a3946b51807adf0efd593261799545c6a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers or delivering malicious content. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ae8a5edc---14272062082.pdf In PDF document text
    • https://stallion-international.com/userfiles/file/56793785553.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/tugubiginamuragisuka.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/tiruvujasokanoradomekum.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd8d67eda---kevemepotipuvigafalali.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/6570915162.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/xitupujubimo.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/favumevofubagenagesir.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/75858293235.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dofomokukuzezi.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/podigomenatoresexiputinef.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bff51eba97---muzobipiworuvofomak.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/93774302529.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/251186180b6b2d0d901bf1c010cc0bfa/vedosisu.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/73052892505.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/tipuvupotujurawumetira.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c308dbd2da8---48315979924.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/zopepakunabokegaraziv.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/84810847541.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e43b8049b3bc6681cde176b8785ee41a/80863300157.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/77093197469.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/remejewakaxi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/xodosiros.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/waxizesodes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lovesong+of+j+alfred+prufrock+pdfPDF link annotation
    • 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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10948 bytes
SHA-256: b9cec2d433d5a161d54b3d020fbee70f150502a11ad763bc45492ffdd00a8477
font_02_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 18124 bytes
SHA-256: bb76801efa4b319a78f4308b9dbc3ea05ae33f4640496b92dbe51686dbe09d94

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