Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe926d60657e2a3…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 10:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3468c25e75b1e9e4611e179e999e8b71 SHA-1: 45c6b02c2c9258470e0fa104dd880815e53c0ef0 SHA-256: dfe926d60657e2a3581bd1ead543ef18eea1120dc74878785a0353276c909ed0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and potentially malicious URLs like 'https://queure.ru/uplcv?utm_term=3+letter+words+with+ae'. The document's structure and embedded links suggest it is designed to exploit users through phishing or by leading them to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=3+letter+words+with+ae PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb8d36ccbb---pifuvatekubobaf.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e0f675781a596403dea194e926ab0e40/fugetezuwizilopigijenovoj.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7a2730fd7---zotutokelegab.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855abee7dec---49238573003.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/69785348382.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/n92h8v5p97grej6v6h4na9f0n7/8241206027.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/017e23bd1fc9ee093529b58f2a67a418/75106387951.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/roxaposu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a31c4b7c---vadezozadagupunasuje.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5b9a81ce1b7875ec84a6b322a3e4902d/lebidanitunine.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zaluxa.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a52b7ac3---12645359765.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4qc383e1ba5irvk2vkgdcs75b7/40552228836.pdfIn PDF document text
    • http://airetechservices.com/userfiles/files/fotik.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d091618b25---ruvunezatofomirakimifa.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/86728391277.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210709_044734.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6723c4e43f45d3b51437101f298be5a8/39748013001.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/jedufaxenuruza.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cq3gas9o9dgjr379qs1lhkm50r/83016668503.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/gelukarowijowepivajofulu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a7ad5bc568---zateroti.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fe823d90---lurizi.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_off0000bb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 10404 bytes
SHA-256: 4dc33f806eef90e9f140affac56fe8edca12f0f6cec4f5cd56defd8871bc38cc
font_02_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 16180 bytes
SHA-256: d05d7ae7ce90fbca211de7b21b24f73db7f686ebc2a026e52d8a61bd8f6a2486

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