Malicious PDF — malware analysis report

Static analysis result for SHA-256 8069043d4f4b13d1…

MALICIOUS

PDF

100.7 KB Created: 2021-09-05 13:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 208a1cf31fb4c6ee67c16621088ed03a SHA-1: bf0a08814d7d09b9c903f9fe3bb11c9bc62b3d0b SHA-256: 8069043d4f4b13d13fd111b623dce09923cd432deb84c06234cdc7395d4042cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further payloads. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 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.
  • 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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607553cc3f678---bebasojobofudamuj.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2c9b0905bf97090b08dc3e83f36d971d/somax.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a15a1bc7ed8eafe7cf9b1bbc70126954/bekipinugarojud.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/96f31ce9caf5b85c4f3146f1ea82f5fe/pufidaka.pdfIn PDF document text
    • https://promise-land.com/upload/file/bapurofurisesirefe.pdfIn PDF document text
    • http://myshiou.com/uploads//files/202108131838038836.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a485a7a5a12---84794113716.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/jalemixojuzaneg.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108240653505998.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429021931347019.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/91459636367.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876daa97763---73912164000.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69e79cf76---99474003997.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160932b736f3f9---murumixiwamij.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4ab5ebf25c3daeac8aab41b57f86ea7e/wokalolaju.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161275464de26f---pojuzu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bkc4tklaecq16khclnmaa9eek2/sosotibejamemotovejalu.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/35369605391.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d00346f83---suvinuzi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f85dce7f2---37848706636.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/wivitewalu.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/5842225895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=direct+and+indirect+discourse+worksheets+with+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 21312 bytes
SHA-256: a6a1d4ebb0c4cc28998342b90dbf8bb48d1134cce5942460ea2b79296ca4397c
font_01_sfnt_off00015401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C18 10700 bytes
SHA-256: 66b89cd8704d57b4b2a96755c5d63dfbec80291cb898a5016448274d9436473d

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