Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63e5170bd68162f…

MALICIOUS

PDF

98.2 KB Created: 2021-09-10 03:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e02f36ad3dfde36dc55e89c04789519f SHA-1: e00586270e7ed09fed08aef1ee900b7984b346d7 SHA-256: a63e5170bd68162f97eeb8efc670b4c4fe9ad04fba6bc764b3d58899d4cbfae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=how+to+transfer+downloaded+apps+to+sd+card PDF link annotation
    • http://miyozenemeryville.com/uploads/files/29250259755.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/27038913302.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/21770361090.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/12404320114.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/kileriru.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/tepujitiv.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/53607212114.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/vetumupuribamaget.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/54997412301.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/banoxajifov.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/10162890081.pdfIn PDF document text
    • https://bagstyle.uz/images/file/jaguku.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498ff83864---tedepusudafenewebes.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/89933226361.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136466163a45---zaxazojububuriru.pdfIn PDF document text
    • https://777mto.info/contents/files/keliwopiz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613713c9b1ba7---bojafupogifol.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328ebf9bfe1---1399282541.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e0abf7bfb8febea7b45cd61de10d5069/fowipotijabori.pdfIn PDF document text
    • http://serting.eu/userfiles/files/difagazi.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xolazazejiniwasovof.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/jalelabewimujen.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/302cf65360e6eebda1619ff2d2184f10/45728725737.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_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 10600 bytes
SHA-256: e4ac8a100d406bc2916e614b71f2240b5be1980aae8e8e8c42a0d7d0e67b1802
font_01_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7D 18680 bytes
SHA-256: 72a989d1b06e5de93c1667de4949f888fa552068d9079e081a5009433faf4362

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