Malicious PDF — malware analysis report

Static analysis result for SHA-256 817c0b7e57bc59b0…

MALICIOUS

PDF

95.8 KB Created: 2021-07-20 12:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd7523e66d24f4f6389f72e275a02edf SHA-1: bdc51cb903f1360337677bac05e81165b591da58 SHA-256: 817c0b7e57bc59b059d3b5e845560833a8ceab8321741e161e7f94accdea1c2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://barnesfamilyre-union.com/clients/52050/File/wopawitozuvupegitukakezuz.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084de579025b---rifipibiw.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/41cb50ddbf74f581359a6afc1875c349/41776947207.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/33475698282.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/29434128693.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3d5e6c0a---dalenikodavexopofud.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dcfd7c6074244e0a6d54e03d9fff44eb/zararowuwifek.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/27255463c35f6ffb1c7a7015937f7bde/35117358306.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210509153827.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/25703192108.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/21395275865.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c210217440e---pazofulanapos.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f2d0feb9---dikija.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/lutabuxawop.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6b8d6093---siwijegepejap.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/21fbdb9577351e90a7d8d6edb5193f03/51326602194.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/58928072014.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dr48f0sidb19lfa5lh581dau92/repuxelelovobulabefusufo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/n4bh4pjmioha1ahdafph3f7g86/28952108515.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fuduzikanafalidafonoteb.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/80009393930.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/385162072cc03a1f4ba1d578b6ca483f/zimewojada.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/78947377803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hitchhiker%27s+guide+to+the+galaxy+websitePDF 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_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 11204 bytes
SHA-256: 16cd05315bb46934da24d45f31eefdbf8acb8dc49a23927193dd8ef0e2004dd3
font_01_sfnt_off00012b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001433a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433A 17336 bytes
SHA-256: 35a99b8fab8f20ceb246d76895d33fbc4b071ab4f1f529ea870cf555dbccc25c

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