Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b99983a5bcaf092…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 03:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23cc8dadb8d3885813ea10b03573ad26 SHA-1: 0e657980823970840de1b44867cbe2b54e701abf SHA-256: 1b99983a5bcaf0920628b99c7d70f6dfd42f3013046be4cf622b543d5a276e51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://samavetpharm.com/userfiles/files/vobun.pdf In PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/rovabad.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/6652831300.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/futuwujoju.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/jubarivifonovuvubi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/nawimufivanor.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/rewukeduwepo.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210916_D7AE16D7B7CC2ECD.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b97bc93fd881b9501f127cafc38acdd5/fizewumimoxavosis.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/fopabowujepinosawufinitar.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/febegaxodopefubagasame.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/36136854037.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/negule.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/61434442379.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/pozariwefobasidebinojegew.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/sunagosikutega.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/73933337295.pdfIn PDF document text
    • https://somogyplusz.hu/files/nematu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f83f18eb417f8a34c8066eeb74aeb378/bobovuza.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/44675034852.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/warupemux.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e91b892f04f4e809228e1934f56d1183/tavesopevimoxekamosubo.pdfIn PDF document text
    • http://nova-auto.com/upload/89828596760.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631256327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=treehouse+near+mePDF 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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 15848 bytes
SHA-256: 9c4a85f5145d676f51e63ed1db9f8322543bdeae4fc102adcd52b72d07451087
font_01_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 10200 bytes
SHA-256: 0917def73d25ae1280c135f39de928829e26d712021b907831fe110f523475f7

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