Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6035d448bbfb46d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 02:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4483773ce9469a9b68cfd319316ece6d SHA-1: 7ddf0647d8f55c5c82692cf0ad8a67a1c6b249a5 SHA-256: c6035d448bbfb46d3bcc8872c50cf9dea7191a243bd0d9b6b9f3a15bef9018ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mobydick-band.de/fckdata/file/riwuloxedovizonigegi.pdf In PDF document text
    • https://capecoralliving.com/media/file/xiripokagoxekuxovoseb.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/30591287282.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/19330914845.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/93555088261.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab059b991---47866729814.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/rumugomixupira.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/93358384525.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4c3b749b7707644c7fede9040f605e2f/86985432623.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/k2hsmludtn5ef12bna0rtlshvc/vufututovikexutovodegelo.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/resitaboxodorufabisukod.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/41348521542.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/71832767068.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/21638537722.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa70561eb---95819283258.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/24l4dhk8fuoupgj5mo26d9dsa9/20816767580.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/829a75f2a0d1dc9c506cb7f896949ba8/83860385674.pdfIn PDF document text
    • https://mszukam.pl/dat//file/66943352616.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8ec8bf59984a5c581a22377689af4f02/30575143870.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/nikelowura.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/wibonowajokuvasuseribidon.pdfIn PDF document text
    • http://exima.kr/userData/board/file/jadovuz.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2352ca971---96565037142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=easy+way+to+play+b+flat+on+guitarPDF 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_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 10824 bytes
SHA-256: 43d81ce1e03732a133c16eae35a9c3cf766977acf8d781ac3f0a9373bc1dd8f5
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 17504 bytes
SHA-256: 3c52f977b59eff6aba0d842b544433a32f18017d8cce18d3ddf95611ad96ac73

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