Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e661c58157b8201…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 19:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1df205a0d5b44a891a9129b28f3f3a1b SHA-1: 00e8b2ce0a950d53882dc15d92a5d1356a36d39c SHA-256: 7e661c58157b82017796150a5594a0fbcaf03bd81b30475e9718b659be22bb56
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of URLs, many of which point to compromised WordPress sites or disposable domains. These URLs are presented as download links, suggesting the document's purpose is to trick users into downloading further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://huntic.ru/uplcv?utm_term=download+captain+america+civil+war+mp4 PDF link annotation
    • http://ifaistos.reality.gr/~triantaf/images/file/javizonut.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210901121240960257070.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021091408465473499.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/rogujobowikoko.pdfIn PDF document text
    • https://riwg.in/userfiles/file/57998290809.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea5d7ad3db---geziwezelalef.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/figanenuzugukemukumanoma.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/xusuzekabe.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/da5807cb8a821108bec27908e2d4b446/kozafimezotaxa.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613276088a006---83714458509.pdfIn PDF document text
    • https://asi-filter.pl/files/file/83233105891.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/tefupujibe.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/30942128647.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/xuzoxikivipewenok.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/70658590671.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/50912811057.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/xosavajupaviwudalimafefa.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/2761208925.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210918_041638.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/88898197760.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/wanotireziwobirezevu.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/15722332179.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/41188979913.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/kidexobetupizu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/pezutomogo.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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 10740 bytes
SHA-256: 80c3bb8734759d90fcf99d18923f9552f29a894e2453116d1ff851761a5c3503
font_01_sfnt_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 16688 bytes
SHA-256: f238c2dde0eeb6e667a197c76184ac87aeb8aa54fcbb410484ef38afa4027c1e
font_02_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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