Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fac51d60a1e351…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 15:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ffd061f2e812d5079ce50741d17c1db SHA-1: c4e2a1ab4709fbea6321915050071b4c81e11af1 SHA-256: d0fac51d60a1e351a107670c1c5896d19e346f6d870faec625000471a3330fbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards an attempt to lure users to external sites, likely for phishing or to download further payloads.

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://inwebjor.ru/uplcv?utm_term=psychology+theories+of+personality+pdf PDF link annotation
    • https://kop-trans.pl/uploads/userfiles/files/jofeta.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1600be7c1e1b5c1b438e3ef646aa5cfa/4831557186.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8b78c37378188dea82c7225709a83066/muveg.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/4ae4fd587d894baf3ace3b4941f59616/lebofefed.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cf6d2454---wozutaxetuwuzomegulul.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/fe8f5424ede0f67e5b2afbff6c3fa279/genexipa.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070631980eff---silare.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/10335315315.pdfIn PDF document text
    • https://totounited.com/contents//files/51390436831.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd31a9b05---16502631915.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/76880653381.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec842da8ee---34106514243.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/27b9fb594e18942a8e9aa0d9e5988746/14683545578.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/45944125085.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/ledimamadufavaj.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/nilik.pdfIn PDF document text
    • http://stromzeleny.cz/file/vuwimaruzaluvax.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/jazip.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/61599834062.pdfIn PDF document text
    • https://bauarch.bg/files/818114926.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091128c0ce4c---9231185083.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce84a1dd575---tazagofaxagafebejinu.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090413492973499.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/pebefisirelixovazas.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bb9d91ba1c17578229025d06a20f2cf9/janame.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_off0000babc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABC 11012 bytes
SHA-256: 31a2fdd5577cb3605499d56a709fb1ac3ec465410459cee66edac5bec6f69129
font_01_sfnt_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 15356 bytes
SHA-256: 16e936116d5dd28d7ad223f31088d1074a499ac8c773167df31648bd1454d046

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