Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20d8fca67b50310…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 12:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f3f1dd086eaf2c75dcdd8a85d527df8 SHA-1: e089dfc6401eb48d59c850656d470a213b8fab3f SHA-256: d20d8fca67b50310805d8ae66647eb685c8c44151e78e2b429076ce5c309b690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=greys+anatomy+season+16+index PDF link annotation
    • http://lovesushiscv.com/uploads/files/jexesezumasozajux.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/kofumolulujozab.pdfIn PDF document text
    • http://only-svet.ru/upload/files/26718809343.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/minexinogimenovaterafe.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/ximezumatijos.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/1663691335.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/felofojariburijazuxufipe.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/texabuvijogexap.pdfIn PDF document text
    • https://europartner2.pl/uploads/8544920076.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/xirufe.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/30520659085.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135963392297---kuwiliruweridufubeligew.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a77865b79---73087242272.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/63469db65094382bdfb399e0acfa9af5/xegapaletox.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/clk5h805nqbq5ds89mt0t96s56/42424218575.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/18779354819.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac11d0697---55256296732.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/godalinivarimalape.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcbeb9b01---zisamolofipuxegamixa.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/fesomibunalegipal.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910221409.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/luzopozebibiwopadoboves.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/59978084904.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_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 10836 bytes
SHA-256: 9385c90daad56956abefab47317df184bfb2ae7dc204678dca0798034e6f2e51
font_01_sfnt_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 19296 bytes
SHA-256: 79c34d4a5f774fb03b2cdba11cdd9028ec535b7895b26a9be7ef2165bca625db

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