Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51846a6394a6ac3…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 20:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a1c8be501b32d507ae5d57eb20cba5f SHA-1: 956c95bfd478661e40765d44d366add33275db64 SHA-256: d51846a6394a6ac37608622e7e7bfbeecec117f483deebc3bc691a8f69c661e6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various URLs, some hosted on compromised WordPress sites, under the guise of an invoice or bill of sale lure. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://coretry.ru/uplcv?utm_term=general+bill+of+sale+form+pdf PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f604512fdc---96204026983.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/vununivepa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d93a9f0a---sewasepa.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70762c42da---82362987491.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/af12ef1d10aa5210cdf00bb9194d0915/54312057297.pdfIn PDF document text
    • http://domario.ru/userfiles/file/28059685315.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bv70f5p88lnnui69v4tkeo550k/womevaf.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a03c62e3925---89150357610.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6t346o3p05emdrbmatjv9o94ge/pogabezutazakeruto.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea9072af06---82202496287.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9ef61c48---dalazuwo.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/jutuxujevun.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7ca19b5f---juzukiropapumikunobovo.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/popadozaxufosofukibuzavil.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/jewudutazesure.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/tikafidanisolipakenisotuw.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d6fe80a82f6adb7f24cb31da9eec6236/90982577180.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609444ca8c5d8---zeboviwabenamufiwolefulex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51d24604---78039811437.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/17293901681.pdfIn PDF document text
    • http://usmleworkout.com/files/file/kapofozajudiri.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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 18088 bytes
SHA-256: 97d287b1b3a962bdf62904c6385223d956cb9635c4ba147069ddbee7dd3325b8
font_01_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 10740 bytes
SHA-256: 15c5383e96ccc52fa68e6354b3865a26b37361e41917a547e78f596e2b0887d7

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