Malicious PDF — malware analysis report

Static analysis result for SHA-256 d305d7205e2dfbb3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 10:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b48b566d2263b12eac0d2532a17184b SHA-1: b840f79ef5bb84a6d9e80ab2be03d3d8c9f4ec0b SHA-256: d305d7205e2dfbb3d75655c07baf7f856f646cbe42c08269a42eca93163e3d5a
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://capesociety.ca/uploads/files/furivolutiwujenezek.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/kupit.pdfIn PDF document text
    • http://nemochem.cn/upload/files/8416584136.pdfIn PDF document text
    • http://hotechike.com/files/files/nexokelurepokawujatumuvi.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/82330647903.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/10853861282.pdfIn PDF document text
    • https://pepsima.biz/files/file/684554735.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/munasasigipimekadok.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/26216958753.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/32391953555.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/fexiw.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/62108774605.pdfIn PDF document text
    • https://eniedu.com/data/file/20210905195145.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/61649415761.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/zuwudetazawesozek.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/purubafem.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/suwofenatevu.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/pomowasaradomukuvapud.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kumurewokilajabekofib.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133823155d66---pirajugepofapagibovet.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f3908f06---doliwaboxojuleg.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d81242829c242f34dea50b17be21d6e5/5826175383.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/jopusebepepezir.pdfIn PDF document text
    • http://belv.ru/userfiles/file/62709069272.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c97778471f4008576da0460de7624b56/tixazekemiletupinali.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630930419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+update+app+on+android+phonePDF 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_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 10452 bytes
SHA-256: 4fc4155fd11f0f32c4a866a32fe4b7df059193afcb2e3839cbd07e0def45ff2c
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 17516 bytes
SHA-256: 13e3e4552bf123f630d613de850f5c4a8126598120fdb6bde074ee82b1411df4
font_02_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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