Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8962a3c5f7dc81…

MALICIOUS

PDF

89.6 KB Created: 2021-09-05 03:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6f61ec9f0595708c093ddfb1f0f2aa8a SHA-1: 970de661f3811ed174ec09b4ed7adc36f8ec586f SHA-256: cc8962a3c5f7dc81788e187a9a37d8c92e92b869645deebf240923f2bdf723bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and compromised hosting points to a likely attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=the+old+man+and+the+sea+story+in+english+pdf PDF link annotation
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/85434370639.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3233ca0a---86156279088.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160fddaff3064c---linisipakegigiwo.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/sesepitid.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/velavorivavo.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/natukumidolosusiguwotum.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a8fb84fd7f8656a492a6f026d800a96/41990907291.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/13398799804.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/senalapadez.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/91gt698bid5lqhdj82ut852e59/mirimo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/0fvjt60e2rrkg0l0lm6drffqi0/xanafefazixukekugoza.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/66745053741.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880429adf30---nogurukasuwasinabilifuz.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/negovagunubori.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/2277455598.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/92962153142.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd2be6ca43---56476528608.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609862c657e34---58295078027.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/gosasaxazimazabe.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///wugonibivu.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_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 19580 bytes
SHA-256: 928c16de5317100ac7e530f8ebdab58d2028252ed4b5111cc979127b292c6f7a
font_01_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC1 11020 bytes
SHA-256: 3ca11c275b1a2f8c5d1f5be18b35d04771aa63b88bc834b6af25a99c3c673e0f

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