Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f978208ffe9574…

MALICIOUS

PDF

83.9 KB Created: 2021-08-19 11:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a81866bb621bff1a200a05740d694056 SHA-1: e249a77ad61f7fd5371db7907fb99195bd54b70f SHA-256: 76f978208ffe957468635232a77bd8614fdb46d4935fbe22f0e4843b78610132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://infrive.ru/uplcv?utm_term=what+does+un+poquito+mean PDF link annotation
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b3a1782c41f06f93d32b464e8a6b06c7/47106336799.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3c6e4d7685998b16678d0b4fcf27b9a3/11378109233.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18082342---99687255947.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080929ce3543---12127577189.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/82933825634.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/tuwesudinumanasawe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ca4bbe930302cf262b53712fe5d1c65c/7523841106.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087dda97cb74---35819363225.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/38668389956.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/21715977252.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/84925202753.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/foziwavawufipabemexuxaw.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/71878407133.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/pemopilu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/a5i46aibp00i0nkic26bf44qt8/kuvefuxi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b320220e222---fifibiwubif.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1991f1d79088298bbca5f473acef857a/rumitik.pdfIn PDF document text
    • http://slsnn.ru/content/file/jesuwigubalovog.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/zotidadanuxabule.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5a30bbf4d88fbac7e35e54df09801f32/87618242407.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/tunawisedaki.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/36568103434.pdfIn PDF document text
    • 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_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 10752 bytes
SHA-256: cf1ae6fd852d64a41443dec0b50392826ab9c01325f5b5ab42348dc8b45df3dc
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 17732 bytes
SHA-256: e91f35d771eeeae5c0b9945fdd746a20b946fbbad6b820c53cb74288d0cc6f3b
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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