Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d7fd0b4ce49e25…

MALICIOUS

PDF

85.0 KB Created: 2021-08-04 13:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0bcc5c111ea8ba4bf73bfba95c27bbb9 SHA-1: 30feed6f887b3274fcfde9daf78ed152e7c520ce SHA-256: f7d7fd0b4ce49e25a3cfaddb43e21d1c04bddc0e03a647d74087c72c669d54bb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains or WordPress upload storage. These links are likely used for phishing or to serve further malicious content.

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9cf8825d---wezosavuveniw.pdf In PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/af6d341a5c830f3420a2c98c3ebd7bc6/nodumanuwigi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4f18dcc4---30268324673.pdfIn PDF document text
    • https://udruga-invalida.hr/files/banojusunujamurozave.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/xijitugodovijaliz.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e2b6918db6c07165d76153ad2263e92e/fabimereduve.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/54087406172.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb45651fc4---xogutaweret.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3466b3696---99419400130.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/88467c30653b27a66d66126074bffdac/4873828798.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/xuvutobe.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/79194463901.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/depumepisaz.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/bd6fab937ef2a17f533af13ad5407c23/lemijaxeri.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/21411464739.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebd22dbb3---zolibesuxonoz.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/90311639822.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d081378762---44526831581.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/97237974418.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/wawexosatami.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/lafivofupepazoto.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160787e189c23f---zuxatizibovajajovonamur.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6ac12a0fbec8387f3fc00a5bd002c6f0/fegelugusiluxivavadufagas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=alt%C4%B1genin+i%C3%A7+a%C3%A7%C4%B1lar%C4%B1+toplam%C4%B1+ka%C3%A7+derecedirPDF 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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 11004 bytes
SHA-256: aaf55ed0d45f46e2654bdf360420d81140cd9394f01fd527e472f047a9288662
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 18516 bytes
SHA-256: 460a68eb3dd6f47d146044a43dc2494f3c16e8a5e9269bd0f7cab62361df7bdd
font_02_sfnt_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1