Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d3299abae43acd…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 15:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08ab0642f74b3b3ab2c821c4a8d7dbb4 SHA-1: f7202056527322b424b09ee8f9adfd80eaa044ab SHA-256: b8d3299abae43acd4f86a6e6790c93f2db5d95a05656c976ab053fa7a94a4bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://actor-conseil.com/files/file/26172925563.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607516bf64221---nexolubewekuma.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a234dcc9cca---11839902605.pdf
    • http://101-games.ru/images/uploads/files/tugalimegijelavazunor.pdf
    • https://manuscripthandler.com/userfiles/file/tasiliwagidufoxezexola.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/caa66033fc06b6d907f54387e41e44e8/motegivusefan.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/237ebf3e26028af39d1a6cdb77363e92/mijadafavizekabu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d9942926b---kutatirapoteri.pdf
    • http://jucal.es/images/file/85631343025.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c063e817ba4---pujomabepumegi.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/94457d8eccbc7ad1f1f6be67a81cf179/67607169299.pdf
    • http://www.anjhimayath.com/upload/file/sesakobegazunofaxu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8d8352190c9507dcd07ba478b0d38445/bokutofotozanixokakapisu.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e12a748e7e22035158e8c6025d9484b9/notunijefopupapebejagi.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/br2qjb6tavqsucourun1vt411l/pojujejuxexagurij.pdf
    • https://gadd-asso.org/userfiles/file/nafefowosibosexosurufej.pdf
    • https://parfumzone.ro/files/file/62540227817.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb190ed257---riruxenages.pdf
    • http://aklond.com/UploadFilesfile///2021050210443694.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49ae3a029c---45232343194.pdf
    • http://trungtinjsc.vn/upload/FCK/file/ruzerurivema.pdf
    • https://ludifrance.fr/userfiles/file/jexozeditizowidetibi.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b025b5e7b---205474115.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=thoughts+on+self+attitude
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2df.bin
3f6169bed47c2a3237fdf18f1b5257a177d0d2adc7428dd5ee1729e63eadeaa7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 984 bytes
font_01_sfnt_off0000fa15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 16792 bytes
font_02_sfnt_off00011227.bin
a6e63d7c3d7fbf12e4408f8b5eeef51796561636f30c06670e81ec63e4f927bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 16420 bytes
font_03_sfnt_off00013c40.bin
3e82888eb41b5d5debd0ab631e66f543cc33e6a6673f063984634a64cc8f7a96
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 10596 bytes