Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfb43f5bf130520…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 15:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fcbe5d1399a15dd747e3e18a576512f SHA-1: 2026e15326c4d9ee2113b37d6cd9f4f35a8b3e44 SHA-256: 6bfb43f5bf13052068d511ecced1b568e42f8a94cb857b950e6dab0ea2c0eb56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure of the PDF and the nature of the embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://alfavs.eu/userfiles/file/25046551978.pdf
    • http://adaviestransportltd.com/userfiles/file/3152818458.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e90fa0e07---89567180657.pdf
    • http://mid-europe-ex.com/images/blog//file/vozopufugusupavovife.pdf
    • https://viettincapital.vn/upload/files/80098837509.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094adc5835f3---xasipexawiviliwatovu.pdf
    • http://guojingmall.com/userfiles/file///43751957425.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501113254139397.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37e36504ee---zogaramapinosofetidolemun.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a790448dff---kanofukozeramizotigifari.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/98026739094.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1f8e2065---nudiwexopogewuxudozoza.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c8abf8207e05d429479405277f4fda76/zojokepulava.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601e8b3258---30177605184.pdf
    • http://liga-stf.ru/i/upload/files/84383994882.pdf
    • http://highendschmiede.de/highendfiles/file/tuzodisesutewefo.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b609a92583---64949870019.pdf
    • https://kuepancong.com/contents//files/85514147704.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b15c0bfc---49975228480.pdf
    • http://watthaistuttgart.de/userfiles/file/74950986923.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6b89dff2edb44c0b6d7456ee8efd7705/68934005246.pdf
    • http://wildpflanzen-planung.de/file/14433121715.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mcminnville+to+newberg
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa1.bin
2cbe69b4b12c78bef4d89dd5a54f7d128876469771e12a870f054168d53ee65f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10528 bytes
font_01_sfnt_off0001029d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 16792 bytes
font_02_sfnt_off00011aaf.bin
04991693ee60f53a6f561bff7a39172a7fab0de889883da44f2b196285f04613
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 18016 bytes