Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d6aba21b3e3e9d…

MALICIOUS

PDF

94.1 KB Created: 2021-06-30 14:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6006b404a53b90108597164c2f4d3e0d SHA-1: 05cd4e83d01e9cb1d9fb25c2917b603c576815b0 SHA-256: a7d6aba21b3e3e9da08cb056d73ee2fa423f7bc8db3e1df61c2551a2adfa0925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on domains associated with compromised CMS uploads or disposable hosting. The document body is unreadable, but the heuristic firings indicate a link farm designed to redirect users to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://yaqeen-eg.com/userfiles/file/vuxuvevizewofepemubigir.pdf In PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2a32bde6572c72e0b33067904342ade5/mukumikejimagofaxami.pdfIn PDF document text
    • http://metallpress.info/files/4271589439.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sugbv92ns5js9r1pclatf87rpb/kunukesi.pdfIn PDF document text
    • http://stylekd.ru/files/wumumibimavokesizoravex.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d4b0f8937e28bc2b0ef813712a2ddb5d/kivoterolutowila.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8e5e0b49f---36287188471.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdc885a041---32977216322.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1849b8c77---86875505754.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/69360651042.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/23095881901.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/nieqe9e0o7u505q0mst0rivf4d/pupotibudokaguxukuraze.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e050c1e57---75621518448.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/luzejisujobavanupizab.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/ditamebifitefo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb6873be1---87098960487.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861fe8327f3---nodabebepudasuzaman.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3821892350---lavegifuzaba.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7e6f21bf462a5ea4db77512b896c1d2f/sukudoge.pdfIn PDF document text
    • https://aedwea.com/upload/foto/defozugofofapirajebegat.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/24347032778.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/94518772201.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d37a48847---52261640931.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1afd4dc550---67604465019.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/98802543879.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098d61d7d94f---vilelavimenavepozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=little+corn+beach+and+bungalowPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 18896 bytes
SHA-256: 267d9744eb7596366efe0860923f93bde8a156e710d6449475bcc66884a4409a
font_03_sfnt_off0001520b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520B 10764 bytes
SHA-256: 637431a6d63303830f35585fd0e079a6268d4aa706bb6783db2d3b4d328b3a59

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