Malicious PDF — malware analysis report

Static analysis result for SHA-256 1392db42e7cc8559…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 22:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19cb3584695c0bff584d5c6bf18b92e6 SHA-1: 05f591efdd0bc3641d5c57a92e8b60a0aef06c2f SHA-256: 1392db42e7cc855970784ae80ed32b2f67857a0b7352daf3e67674caa279e8d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=the+contentment+journal+pdf PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e1645f352ab5c6b89e6ac931c3c86536/fevivinevego.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/lsg4nibfmu8dvlsgj6d7l4e863/kufilewidesu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ian6aifhu6e2gfnl3v5segvqof/24525810996.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///74565430877.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/skb5vbrra46rcoe0sfc63hd35t/77682667933.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c875e959---60958619123.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f6380101bafc5510931060e6e8440062/59391853664.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wozokizorazawid.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/xoxaludevoxifibuzuvije.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tl5htnjuukc29fe8gcoturpl5r/koxotezer.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/samizafenu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58e8eb06f---9474995649.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/lolumitawa.pdfIn PDF document text
    • http://bulmarconsult.com/files/ziwife.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/96685790006.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/nlg306182464ba9juqp7e3qis1/15225022374.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607894d9af567---52573320009.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/mkvcbvoc92em6nl1jdoaauba9r/65986214096.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/89667961896.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7ce28cc92e428d2473f0ba0cdfcdcbf6/55739402259.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/oatftpu4g398sd2uu4haneehle/kurewijifanamokezisawum.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0815d6f900017b15c8ddb942c6ae6a65/gupep.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_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 17964 bytes
SHA-256: 52a34f510fa65a1608e8d1f7b22943b9586dcc31b3f4f95ecc5f0b3542c4ddd1
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 10820 bytes
SHA-256: 2784a9eeaf2def14113a8649077135a316838e03811b8b28d691154567b4a9e9
font_02_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1