Malicious PDF — malware analysis report

Static analysis result for SHA-256 f606021972df7f7d…

MALICIOUS

PDF

94.1 KB Created: 2021-06-27 23:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 00ff700edcfe33bf70f55b935a2e10c1 SHA-1: 19a685b441f684029e3ae386cf9bc1ecba521767 SHA-256: f606021972df7f7de6bf45536be30883db2f830de137fc8d8d334711708cd636
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories on multiple distinct hosts. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • 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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05fe146792---29786931786.pdf In PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/debadaj.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1d030b4e---judadotuf.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a972f0e32b---tijamo.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/1854660845.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/73a8ec050e5a5cb30118e6e77f7670ce/82275469326.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/498ec36d69f611bb8ef39ef8aec8e11c/latewebizovugubagufitegot.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/bozanixesukexajalemeva.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/weluwefegawujidu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/p4voltjeue8cslt3da68bhes97/kuregosilono.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/59864625599.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/30718819517.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/35863765908.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609145350f3f1---78503583632.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa14e2d99---1085340588.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/27404353456.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/56737850174.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fababumapir.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7b19b2f5878a2ff521ac4d8fca2b13d4/42220919619.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/lapiwixuminir.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/17252234686.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210530_113606.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/40f705d1688ba3db09d477cad58bbc65/2080763858.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a11ad22d177---xifexegazefama.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa69f1b0aa---42828060298.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/62848608581.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8433479a---33312167784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=corn+plant+leaves+droopingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 10664 bytes
SHA-256: 3026730be77f15fbe371d988d0ff3a338ea15fe15d0cd53e43bc15f6a9c83ff5
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 17344 bytes
SHA-256: 1527c7e91c02803358f1031c2b5f6fe2632c20faff8026a08363e6a288b0b3e6
font_03_sfnt_off0001548e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548E 16268 bytes
SHA-256: 583775b412ef5c49e1e3d1d46ae6fffe4f2c7bf2c5385fe3dbdc3cc68f632db0