Malicious PDF — malware analysis report

Static analysis result for SHA-256 c388a33e6d197cfd…

MALICIOUS

PDF

86.8 KB Created: 2021-08-07 17:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c6d9125f21f84a4754010a96fb1c236 SHA-1: 5cb8e0d13afd484e18aaa0287f7b9bc9f5d4dd59 SHA-256: c388a33e6d197cfd8182ee0bb6833858e148f01009defbc27c82c071ee8e7e88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to compromised websites, suggesting it's part of a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=how+to+get+a+mod+menu+on+black+ops+3+zombies+ps4 PDF link annotation
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098777694013---91039959346.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/oihq11batkvf572vja3l1r9d7o/bokejadepibaxevovovik.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/2482976720.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa63c7f199---mujirujifinit.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/vasuji.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/58dcbe0fd7bbad7bd70ee1dfecc37b23/82686736271.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4mkqtoltkeo43hp7ftecrmtfvj/xojemavijab.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5ad8835d36ec0d74d1c28a62deaf5c05/gudenejajivepafikuxuxoz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8vikpf2eugia3fpjoekviegfci/jopotawut.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3e7c15db322bf6b14b84e412031ee1e2/49452253040.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/40235527771.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/puxugagevuxamexaba.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/52718085542.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/lipevelik.pdfIn PDF document text
    • http://chieucoingason.vn/files/gufutasewixes.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/89813609603.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/69dd69f805e5886cad66de552d2b6e8d/rakep.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pudagulijimabisexezaxeme.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/kaxanibimi.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/duwuxijugewimo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/68001882754.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/ef47543947aff1cbe5c70a01c501ea40/29864125835.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db9a360f449---gojulidakuf.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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 20632 bytes
SHA-256: ee4c1af3e8c180a19c7b75ddb064171855db159021da3b81e1cdfb5915d3c056
font_02_sfnt_off0001322f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322F 11476 bytes
SHA-256: 871c7c32828122c3f650b1388b5318280f6a6672f0aad84f0b2cf3230664d446