Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8962bb086a245f7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-24 05:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b1351e1a3e783ed8a8ecea783c3db31 SHA-1: 7ceebe48c3053c22bdfaa66a0d81c16f4c246cc5 SHA-256: b8962bb086a245f750a9cd77b8c08ed6c5c03ea1edaaddc982b9cdff0337982e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating an attempt to host and distribute further malicious content. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggest a link farm designed to redirect users to malicious files. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/jic391afn5nktr9lqkqh33vb75/7035419445.pdf In PDF document text
    • http://domplus.su/userfiles/files/2893509848.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pures.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6f840eeb2a4abe7d7ec18cded549b88e/vigukibijoposejiwedono.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/sazisifi.pdfIn PDF document text
    • http://anpharma.net/upload/files/gijobesomive.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/48130511601.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/22881475240.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gugoxozakarutanesab.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisirev.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/pivabuwepuzudawiwexewiv.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/jizojejowalabuwitozelilu.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210923232043949389ge45v.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/dixuvefetanodimubov.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/gowokikebururipibuno.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/2760811257.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/10405683884.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/12408290892.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/jusizimu.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/74169443901.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/vevatazokumotiv.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce80547ac4---zapepawutujitevinutuxalip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=alagappan+medicine+book+pdfPDF 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_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 17864 bytes
SHA-256: bbc4df5de73f6d40ac337a5ab3a78946e8c57923dc031bad1e0dec8b63090008
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 10808 bytes
SHA-256: 85b4f190b89e6a5899f6d4b2866e4ce37c20e83b4c3270bed9e7fb79bc4a5f4b

Open this report in the interactive analyzer, or submit your own file for analysis.