Malicious PDF — malware analysis report

Static analysis result for SHA-256 5775a1365b747e34…

MALICIOUS

PDF

84.4 KB Created: 2021-07-15 18:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdc14b16a40eaec69b648136ef3e19cb SHA-1: 40dfedfbedc6621fa158d71e87f90c006629a425 SHA-256: 5775a1365b747e345c2aab32c2f5b860afb1ffd5bef80cfe1a2acf625105758e
146 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV, specifically as 'Pdf.Phishing.Trojan'. Static analysis revealed numerous embedded URLs, many pointing to compromised WordPress sites and one directly to an IP address, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4017

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://zpb-maciejewski.pl/upload/fck/file/35963485176.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b31bca3c839e31ab2aa640ca82b6206e/91651991754.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jusodugabawuz.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9800b28aa---46478278591.pdfPDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a619d534---46945613389.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a3e2c15b0---52521069195.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/56809121229.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fa8180bac67e8a3c26311c8b4535be0a/43704342573.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/zizikejagib.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/61693746512.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160945f40f176d---83519920924.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/49101661249.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/piribililufuroneki.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc950346d8---jopedapasuxilimaj.pdfIn PDF document text
    • http://www.siposferenc.hu/html/25873017889.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/66bcd81298e13f327ec7988387bcbdb2/riwita.pdfIn PDF document text
    • http://congtyrongtien.com/upload/files/rakozokutigotudomili.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pijutofuwetunavi.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/39676386904.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28397d1ddd---xezevedubufojetijipo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/fonuvik.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5965e7c7---wizegiv.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6ad8df3153a7e2a9eba524ab5854b80f/3851125059.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ca0699d9---pifipu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a851119f21---30535591739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ingredients+in+sinigang+na+baboyPDF link annotation
    • 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_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 10580 bytes
SHA-256: ec6d5b8da91c1d78b8cf0621302fef0e8fb02e63a61eff62a8d441dcddde9281
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 17896 bytes
SHA-256: 1741e9ce5a757d99d61aab77c714e9edcd21f3ff72f141aaf3bbe198fb6fa586
font_02_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.