Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cbf6f88b19e051…

MALICIOUS

PDF

87.2 KB Created: 2021-07-22 07:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f089e7309e3dbf92fc12150c186a99d SHA-1: c817c6358ca716394ac8fd786be451a2cdb6614e SHA-256: 05cbf6f88b19e0515fbfcd65f9cb01c442bffe485a91334a6d2210eca625237d
164 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The 'SE_INVOICE_LURE' heuristic suggests a phishing or scam pretext for these links. ClamAV detection and ML classification confirm its malicious nature, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d6f57b3370126597ce687ca9223cff30/48820492497.pdf In PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/rukomedakiparo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0118fef60a2bc6cbd7c815be9489cf30/faxekaloxibutubebare.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cecb7aaf09e5a573b4a73255d3a42df5/64573991605.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/94792148435.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/87820652702.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/80254547234.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/jetezevimo.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2rmuaedq0jp4dctpqoe3hl8h11/vafoxebagaketuxu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/wikisebubidabinuv.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/487b41b809a3df08aed02769a965cee0/43913877851.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9700be73---zojafinotiguxejugaluzo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4vk1cm5ejuehsbfqdrdm996vg5/vupud.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160748b5e3a54e---49752710142.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/22d4a4e0424d4f4475a81c24f524849e/6605266719.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/50915014317.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/fekatanizesosuw.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e1f0b93d0---nofuziki.pdfIn PDF document text
    • https://birudongker.com/contents//files/86187442062.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/87302341232.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3d9f4ab7f1ff5349fb3c1129fd1a99e0/kuxufumi.pdfIn PDF document text
    • https://mahae.hu/files/files/75865780560.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/86695871271.pdfIn PDF document text
    • http://unityproductions.com/upload/files/rerup.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/451094851b48a40cd4ccfbe0e239af4b/juzixubixolodenosidovewi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c985a22b9---76830203969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dr+chao+dentistPDF 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_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 10424 bytes
SHA-256: d3a1415ed18534b8be175e728041a41ca6a668d4827f088a6aca24b2edf1b951
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 17036 bytes
SHA-256: 3d8acb135c326875d03caee08d041167144b9901a16363141e34309abe170a7a