Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f21098037c766c…

MALICIOUS

PDF

128.1 KB Created: 2021-08-03 22:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 955667ed5824aac06a7fc71619774241 SHA-1: 0f41409d77d8d8344e7f616ca05b9750d9a8cdc8 SHA-256: d5f21098037c766cb9e00f213393a85960fa1a1010de41f56f17270ca5c6c03f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS uploads or disposable domains. The document body is unreadable, suggesting it is not intended for human consumption but rather to facilitate the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9592

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://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/83214189478.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acec76858f7---jikofagux.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4911a6d66bdb4b792c0cf6ec588cb8c6/dotabigamevakuwifetifejup.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_131815.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/dizagajobetewugafo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900dd2d0049---vorufakibisonigekufifusar.pdfIn PDF document text
    • http://ipllaser.in/uploads/jolaganuvob.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4072b9f8d---ledaranabigozub.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc62a526fe8---wumimetisidunajuzoxefut.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1e35dc9bea40a90d142d842f44140691/watokedejifu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c13257102bc5b3a9f177ae64dc902739/6662710595.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/60910730911.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/55768491175.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/3668182856.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/najejerepalovamenufojo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087efe80fed5---dosukevijezox.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/bivukobozubodefewafitid.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/zukikafarunevanasinolafaz.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/kimijunuvipuzinofil.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/831b0a8848ae0420a8e87a1b3d72517b/tefaluvo.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5e1f1c108d684a0020b88b8a300f95dd/niwojawutowadozik.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/jutafexediliv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbdb9440dd---kalaje.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c905b22ec1d0d44d5ac9e299f48bcfe4/ziwotezew.pdfIn PDF document text
    • http://techbis.pl/files/file/99842303222.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac778eccc---15751196365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=imagenes+de+goku+para+dibujar+con+colorPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001784f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1784F 19204 bytes
SHA-256: 5d26b6fd0716be4e946511e513d270b971f58f66fc42d2a2cc8283284e4fd5e2
font_01_sfnt_off0001a967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A967 11172 bytes
SHA-256: 610b91fb4711a2affadd0b4870917695f507a849502231e66d0bdb27ed53f929
font_02_sfnt_off0001c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB0E 16060 bytes
SHA-256: 2f306665d4631bf5729dee2f35834acca0f59e1db4db562b112de954dfadcfa4

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