Malicious PDF — malware analysis report

Static analysis result for SHA-256 42840b0ddbd3c4ac…

MALICIOUS

PDF

84.6 KB Created: 2021-07-08 20:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4135b059f15c12e4c8f78470c95bac53 SHA-1: 2c073456340b9cae0a456f38d053732c51f81751 SHA-256: 42840b0ddbd3c4ac0fae9cc997be8392cc1580ac3b431929bce909c94d9b1a58
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to obscure the true malicious destination. The presence of numerous unknown URLs suggests a distribution network designed to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58be71127c---90967057833.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/be3342f362ec4e372faae69dd0959ece/fozasukavamirojuw.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/74236259114.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/5187427409.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/ruzularawiwikesefalen.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4663e3a6a3---sogudabivexarefazifum.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/5911098662.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xugesabolametuxivofi.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43d5df51a---87897446022.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e3201f9c9435a635d0c79faba0516eb2/refivepirukokaxem.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/safazazozirojinaxuw.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/cfadbf9fd572df9166dcad82f04bcabb/gekofakoriwutiboxewukal.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/49155441125.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962395c2158---madumekiwumazo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2kapqto70c2dmkprbalgl7v2ee/zoguxewajogevunovil.pdfIn PDF document text
    • http://apcmagon.com/userfiles/birarumigatadelapaxusa.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/voteromerididutekap.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/80506906351.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7ab49dac8d12586583f32c584139ffbf/lubenexoti.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/fopevumiwipuwiguwigabe.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jbttg2a0cvnak4reeqo176gr0m/146027226.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e72c3d80ab4---6494346686.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa6430be0---sokanisagilupenes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+bypass+icloud+activation+toolPDF 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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 10904 bytes
SHA-256: c179e252b557da7f372bf9a261e5b43b7c2383fcfa7994fbf1fce6103cbfa970
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16632 bytes
SHA-256: dac71fcde6f2d4737dfb88141ad810719d8694a155c65f837618eb9b44fcf785