Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a61b59d649d6773…

MALICIOUS

PDF

84.7 KB Created: 2021-07-27 16:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: da61f8418dd3f0e7799172439830a21c SHA-1: c61ba9bc3897fa970d62a92ec8574f0e6be82c72 SHA-256: 7a61b59d649d677366e5d3cbaf19e5bf7ff44c8a1736ad885d029b23860c0d14
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external links, many pointing to potentially compromised or disposable hosting, supports the classification as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076f57c95350---14822932908.pdf In PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/2q3cjvjm7595819uhgn2lak1ip/sijokek.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/65258761625.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/buxekabonofegizokiki.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/7ojorg78q8tsgt129ct21b5ic1/55714635043.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fijozibaze.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/96447623695.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/zozedidodot.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xisejaxifukusas.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/qd0k2v22guc0lemeu96uqp1nra/26825735428.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/fufizuxobi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b5e402ce---zibajixopeximosigas.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/43523177622.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607612b65ab61---93793001931.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/vufej.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/womevijofedi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/dd19d5bba276cfec26782eeb3c86c353/35562780400.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/3998273644.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/joweterimetoxa.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/menanewoxofanezeruli.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/87q5fnkg4fjl2m6fffhmnq3usl/vuzedemijitonafo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9669249932---zaborewenuzifizalufoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=heat+and+mass+transfer+fundamentals+and+applications+citationPDF 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_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 18128 bytes
SHA-256: b953ca2a951ad7ca8adea9a3ecb66770c074128ef8e7873012196dbd36a04a18
font_01_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 10872 bytes
SHA-256: 55fa29ff4a9e856b3f288b003df1fe276f43c267e64fa53ea8472aa57a18a831
font_02_sfnt_off00012c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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