Malicious PDF — malware analysis report

Static analysis result for SHA-256 848b2d0b44ab7e22…

MALICIOUS

PDF

87.6 KB Created: 2021-09-06 23:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78652bbdc0f04e5a308a7aaeb1cd991c SHA-1: e1e774590ad2e542b8fec23b092c6fdb79bdaa18 SHA-256: 848b2d0b44ab7e22c87b30085c61c0b07a02b3ccfdda4c4b13e3c855485fb010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of numerous external links indicates a likely intent to redirect the user to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ba79e2693c3af55f7b675074b9e92575/nosogulej.pdf In PDF document text
    • http://lexen.ca/userfiles/files/rapovujebosinafexeweb.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c1371b3ff4da6cb63dba19905135b658/lufurubabebosubozujixegez.pdfIn PDF document text
    • http://fultonhighschoolclassof1977.com/clients/a/ad/adf64365ba34d951c098eb677b062caf/File/renipogasuwolitopate.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/joserivagobad.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/57001082422.pdfIn PDF document text
    • https://x-software.cz/data/file/zanedofujemirozaza.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3fd2fa570b836f1169f91bf53f5a8f36/pawikajamakebobofokag.pdfIn PDF document text
    • http://toonesk.com/upload/22571565028.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/kipefukilumobodizumuxi.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/zizabilotivuw.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160866d444eb5d---78171483976.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6128519b0363777cab48044625792b9b/tafubonumulinetoperak.pdfIn PDF document text
    • https://dm288.com/slicice/file/forut.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/demowonakasas.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3fe223ab---59490191978.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a8b374bc---rurufebazipetupopewet.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/namupipizosubemiv.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d28e1fe43c5---zoxor.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/86878349776.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210803_451908C984B59B3E.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/99715017333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hanuman+chalisa+pdf+file+in+teluguPDF 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_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 23440 bytes
SHA-256: 5fa9d5779ff6475c5881564f6e144a45e184634c2fce8f9606f0f9008d03d549
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 16900 bytes
SHA-256: c8d2e8cc26ef0f0af18c5e7f3b9b17014f94eeb758524c4472702e26d66957f9
font_02_sfnt_off00011ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 10940 bytes
SHA-256: a0708963085893674493d7ffca81fcdc352cef8ea958262997a0df27c3cf3282
font_03_sfnt_off00013784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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