Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa5ea4d9b9599d8…

MALICIOUS

PDF

100.8 KB Created: 2021-06-26 02:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 345a5ee65f95dbb6a8467728d396e59b SHA-1: 0a2cd04b1b4624496af2ead791688c37aeb0fa00 SHA-256: ffa5ea4d9b9599d83ed0973a07cb457874f7af919824fe9d0a27b860345fc6e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to various URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to lead users to potentially harmful content, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/l93kjhf69p41tguvpsbnjgvg67/seden.pdf
    • http://bafiti.com/sklep/userfiles/file/23671346089.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6116625cbe---fevajikobunivu.pdf
    • http://argol-editions.fr/userfiles/file/putadutasetaxa.pdf
    • https://asiarsolutions.com/userfiles/file/58649435196.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fd3bd9ca8ce5c627640460e8719f0b8b/98622844723.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d8a93e75e---logedunedetogij.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160705fa0e368e---gofegixujabufimokogex.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdfef0732---jutuzesewaluduwoka.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1a356d8eafb893ca1acd76e96b6e2857/retazurixoj.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8928eb11---nifozukalefegunekotovora.pdf
    • https://alatheir.com/atheirwsfiles/file/14481199298.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7f6cd4bb---kolawufiror.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cvmu7aod0ghug4f5o8ngiugj3m/12793823289.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160723d808475a---gimujeripamevunetoma.pdf
    • https://lacaune.hu/userfiles/file/71091628882.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/zames.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818c52b37fd---88166784655.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a3d270a8---95312013691.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec41f62a55---xixolerojefiwifo.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/aa4abb90e45803dddc94ab8458993507/ridojaweze.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607810b98904b---32577695413.pdf
    • http://www.pattyn360.com/upload/forum/files/jiwejulopeduman.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/21134bcbd63e6756b0294a5c2fcda83a/bozizosilet.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a178133220c---79948298717.pdf
    • https://adepotcustom.com/UploadFiles/file/20210511195728142.pdf
    • http://coeb.eu/userfiles/files/59610268753.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=reface+app+russia
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001061e.bin
df5d7be06f7a253f9dc197bfdf8d303821c8c49103789a8bfcec7116f036a5bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 10252 bytes
font_01_sfnt_off00011d47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 16792 bytes
font_02_sfnt_off00013559.bin
543fbf25efee61e944436f9ad0c9497da3677e8bbb1999fe59d1d3e201c92de4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 23216 bytes
font_03_sfnt_off00016f72.bin
056c635445ae957760832ad9ce81bbca3f4175d3b80c9769c6e0874bf6aba3e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F72 16308 bytes