Malicious PDF — malware analysis report

Static analysis result for SHA-256 752c79c3682661f8…

MALICIOUS

PDF

151.1 KB Created: 2021-06-11 18:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c9f426275d9aabf350222f9f7d341af9 SHA-1: e2f9096392f0150a6dc27929ebcfb729029fe8cd SHA-256: 752c79c3682661f800c15487b6dfffef53b0b7fb76957ef8364c92e7dab16b00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and time.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=john+wick+3+full+movie+sub+indo+lk21 PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b2edc6d8---fewabaxogirazupiludek.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/35658931153.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/sivuvuxibuzevudilafejo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788e873d0e---54171119579.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609876b56accc---lilepatiburemusifimumegar.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b414d85ea5---47525290356.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5of4tllj62r6g1kj113smgkl6h/40820024726.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe51564029---dijiwidisuxamibamapitikig.pdfIn PDF document text
    • http://askort.pl/Upload/file/nebemimid.pdfIn PDF document text
    • http://com123.vn/uploads/file/6093128250.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b3795cb99266eec78dadcd00880af824/70745393267.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f4fa53dfd6313a82e1d647f169b87e2f/tasenap.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/56186591241.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7a04faa57003a9962958e32587cf8626/dulunonetogikebaruweka.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0c4270c960306ab4c00dc7f83c3f8ee4/sasedeweseturobanigenotuv.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/7657200301.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/pepaginugisowejuvob.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbddbd38bd---xadidagofosota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0001e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7D7 4204 bytes
SHA-256: 780c8d7e50d89d0177b35382ad53f3dd61b9926c1563e1f68575e341cdfb9919
font_01_sfnt_off0001f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6AA 5648 bytes
SHA-256: 4b29f569fec75e00cb0dd68f6ff149bf78120e12a03700d02e66978f29eb7538
font_02_sfnt_off000209e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209E1 14132 bytes
SHA-256: 0099f65aa33c212d2c03a47398500e90384ff346a331bb422315b957c8043d71
font_03_sfnt_off00023710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23710 16684 bytes
SHA-256: 4cd55fee6c52bbab32ed20b0b25846bff407090075fa0ab45dc9808449a8eeb0

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