Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8ce220f2caaac8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 03:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 624ada38bc01b67388e828a11a32452b SHA-1: 1313b4fd3b7d87d382bdaa080226b16c37abc298 SHA-256: cc8ce220f2caaac8e0b3a2deace6db531c20cb541eefcc9f20053e1be07c3060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://eko-baby.ru/userfiles/file/gozedomixitodoxogolofogas.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9a43ccde---xukarizu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/7148850659.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161466051f2f70---nonafozuj.pdfIn PDF document text
    • http://falconltd.pl/cache/file/83058701465.pdfIn PDF document text
    • http://prota.ru/upload/files/kanuxedavivakoxud.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613d44890e14f---nukefutokara.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/89610097504.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16138e50b659e3---konanifofopavapuvilevapeb.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8ca07fbc---belijugu.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/14223358626.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/15096069207.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/zinalukagunimesidanora.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/58366649965.pdfIn PDF document text
    • https://allianztc.ro/files/file/turuv.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/92953262717.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/zitomamen.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/45513642774.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4d122602f781e4799e53715e1373d280/jiwoxafekuzuvitifebego.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/97ce4264fbf5e8adae9f05577d65d1cc/75843653724.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/26493806221.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lepaaq9bobs8ssa6gccols0e05/53262363677.pdfIn PDF document text
    • https://5udua.com/contents/files/97948879455.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/kuresuwugopevobawefe.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/61128704124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cop+the+recruit+ds+romPDF 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_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 18288 bytes
SHA-256: b686600213509c62851ae294ea1fc5cf714918b7ec8cdd85f841435f566077ac
font_02_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 10596 bytes
SHA-256: 1a17858352c18f4fca9e70363186fb3c2b800fc8a572ced25dd368672cf962a0