Malicious PDF — malware analysis report

Static analysis result for SHA-256 00941c2ae55442f0…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 06:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baeab5901a6642db96d282407ccec1ca SHA-1: b14d466d8f8a7e5c14ecacca7157d25571e22c03 SHA-256: 00941c2ae55442f045470bc019320e00704e979326f54cbc65b4d981c115d9f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary goal appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=three+steps+above+heaven+123movies PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/90099193029.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/95772175833.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dc7bd15ce---bifilepu.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/giwusitoliwerodutodogoxip.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/26339293444.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bbebddfc0---padubazinozarimip.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/wegemoxefutogeliruk.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/73563512027.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/96219700092.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gumavub.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/10174578841.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/37326058135.pdfIn PDF document text
    • https://alutat.com/data/file/toluzabevabim.pdfIn PDF document text
    • https://patc.fr/imagesfile/kimijugopezozizo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1167f0b2---kedakigabomuxizoba.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/80867273396.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8109836c12---ruboxepu.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/5409486527.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8a217afe---29352541761.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/45324441684.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/kitumirutetojepubok.pdfIn PDF document text
    • https://southafricapools.com/contents//files/kamipitofekawudiwukiga.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/miniwekisir.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/xikedowumosobisofilojav.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_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 24104 bytes
SHA-256: 451267ac7d3046f9df7e422d34fd931b885ccfca0a39d97f3167167ac829b516
font_01_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001337b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337B 10984 bytes
SHA-256: cda058908d740371ea3316988148727a76c95a9679a745de987cc11fb7930311

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