Malicious PDF — malware analysis report

Static analysis result for SHA-256 37882760add31d7c…

MALICIOUS

PDF

80.7 KB Created: 2021-08-30 06:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8086268138dff09414384952505b752b SHA-1: 877fbe3c5002d3c147f47db8c4f90120a0e36587 SHA-256: 37882760add31d7ce6214a4526fa2948993a9e2c8c703a3d71f9d81f30f6517e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/79674442848.pdf In PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/makazatenonobufowagib.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/lejegarewometetiralonar.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/84414431987.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/70169394960.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b605bdd5---lagelejapapo.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/82160018164.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5dd3c162711e0218cd730d38001bd9f0/138836652.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/86448218949.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/jojove.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ge78hni8t82fg2rdfk77su2nha/73458779667.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kirignt0q0p8fe5jpkfe9rilgr/7944968690.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/benm89e2ntkr8iat2k76lkgoik/64357469602.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/farakaruvisewex.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/228e47864c08a3188d8c195a24231e58/balesowotarizazobije.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/sotexekexegejipurozel.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bejefiriwob.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/99718601033.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16102d5bfa61d6---3657077119.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/clucq56gcegq9429bkjestqns0/99423731402.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jthmra770nkmcl2j44jpcu97f0/rawarawem.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/woputazumegadupidonabi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16112e9a418add---17864517993.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/54d3e0f2c002c3b865c554c49b23de06/61889018418.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/68629426625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dimensional+analysis+examplesPDF link annotation
    • 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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 10432 bytes
SHA-256: 3c49989a0f93bf31571c4b2f5a44b2ea48061d8c61620dda40834cd3a6cebb8c
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16660 bytes
SHA-256: 8e1d2812ee173d8bd65aa6eddf63c885101f4edc7b3e610adb62360601d3c8e8
font_02_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1