Malicious PDF — malware analysis report

Static analysis result for SHA-256 9918c02271176df0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 00:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: affa199c53e72c615de8728e535648a7 SHA-1: f994b4a10da9d82d5286eaa7ca51d8c0f354ca65 SHA-256: 9918c02271176df0b9f7b5b12b332bde6b207e6c5da8533b7e3f3971ad8cc536
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_URI: External URI' and the presence of multiple 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' firings strongly support this phishing and redirection attack pattern. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=download+atari+games+for+android PDF link annotation
    • http://tenis-klubmoj.si/uporabnik/file/4332629491.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/61864428410.pdfIn PDF document text
    • http://vina2002.com/uploads/files/94909073833.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/bawuj.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/gobalafogagutamejenuw.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/217329606.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/dovopokugobiri.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/suzelojadakiravenarase.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/lijonudotek.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/zexaloxenug.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302f01a064a---44045476429.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/wugasatuwe.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/dedudikatisumatigozigos.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/lawabizowirono.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3429bb9196437c7a30d6c2cd7c10368b/15080582836.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca818613aa---faxigafuxi.pdfPDF link annotation
    • http://cdenito.net/userfiles/file/68304085133.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/61c2b7a8e84b1d566536f08ff08d06bf/8123816017.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/xesubigetepoxunasol.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/wokojekupexarig.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf9980e58---62669739880.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ada37a4e3e234e780739f2b2ebb1c79a/vuwirijozixuwewikexetejuw.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/vegakogupilepividewaja.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/35908244141.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_off0000b406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 10784 bytes
SHA-256: 0b8512b77c029a495d9ca77b93f27d5f974225845c906056d5b1479f9efe25de
font_02_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 17256 bytes
SHA-256: 4554bf95e753bfdcf3f023ba6cd53c578510d9c52c7619df41790bf2fe45050b

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