Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fb737c70d3296a…

MALICIOUS

PDF

92.5 KB Created: 2021-09-03 06:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63e44f4aeb62f4eb92fe0d92c90823a7 SHA-1: 3a52641bbd967cd564d584eef373cab1bacdb873 SHA-256: 77fb737c70d3296a09ab6b8a42a271887f4f4a1093225c287381f79b1264cce6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to lead users to potentially malicious content hosted on these sites. No scripts were extracted, but the overall structure points to a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 5

  • 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://marcth.pl/media/fck/file/kedakuluzotuwijewiduze.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/xisofumepiwazoluno.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gapunaxaxotepapuloda.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/56980866690.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a141d03cd---kanisojuxarivaxuxonumuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609210ff601ac---63914470888.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce20e3610f---54631128146.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ho1j4ejqce5imqpsnih6810an/minuzupazokadilesim.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zozilogazuzifaxozuvew.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/17422561744.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/rojojitajazonegonapud.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/tebugapasepater.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/lsj13k2r1p856upr40j832q0bu/denomekofimamam.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/xewudobuxi.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210806_000350.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/74990622514.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc00274887---39619502025.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/43797425633.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/bunupefaxoxevitemoneta.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797190bf29a---newetefapava.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/jazupazazirusuwod.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/mupogonezelaxireli.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/8969102757.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/feras.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/8937920367.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/tasagixalixodesalajexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=recitatif+summary+pdfPDF 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_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 18756 bytes
SHA-256: 1d28fcbada3312e8d8d95f584483c3748d58b9cebb230b7852ddc9574ed271a3
font_01_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 10772 bytes
SHA-256: e49eb98c1737c9a20078a24fb216ec62039b2ef01905cea6e5900728b95894d4
font_02_sfnt_off00014c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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