Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8be99634177b74…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 09:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8d43bd9929dae03276ba844b6ff8979 SHA-1: 263649e2838744fdabb751854591f1252edc3149 SHA-256: 5e8be99634177b745a16725bf7eb515c9a5cee6aa523b7341ffe2c0ee81f036a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://pixomot.ru/uplcv?utm_term=dionne+amy+winehouse PDF link annotation
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4d138480---20636457559.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/43717889822.pdfIn PDF document text
    • http://yuha.be/_files/file/34589592549.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070be3373b8e---mofelu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9826722fbb---73296661903.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e7a6a6df---66612056781.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ccfcf2104336ec71849d7a8111e19ca3/wiwuridifizu.pdfIn PDF document text
    • https://iword.de/userfiles/file/53798966450.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/23267920194.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/namaxabapetedimagevemo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b415f61d8fa773648b4e7f9fff022cd9/wukuxorixenewato.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/1120490867.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/89807201954.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/wumebifejajeno.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/59800164793.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/delepu.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/7625a372d83eb279fd2d100ea6893c48/zesuroropogeni.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16126d466b8180---84510757737.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/abbee8d2c871b8ef42797c25b655962f/77190025936.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/nividotuzujewiporu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0e0939060---xezolewupororadukovar.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2771c014---sowuzugorinojilul.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/23620d472a6bf6c80e3a7ec52c3fc599/ledaf.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ae2cd0169---nosufotu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/20162267168.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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10432 bytes
SHA-256: aa2d67cb0cd9b6b953f090e17f2cb2424e4c0a0f59d3c2c4d185a3c1f6659ee7
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 17700 bytes
SHA-256: 7d8d22af3baec446e42b0f66bb95d27fd60cf0d1a032ad6da2d119762818bbef
font_02_sfnt_off00012c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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