Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76d1b02792ce897…

MALICIOUS

PDF

82.1 KB Created: 2021-10-07 19:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70d0ed77fb0f54d7bc8ca9be68e283fb SHA-1: 3bc431cabaa350ed06550192d5808b39b1a24abb SHA-256: e76d1b02792ce897311837ebbee1a95c2f609d9b2cf6faaf425ebfbb5874cdac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anchor-m.com/js/upload/files/zapaso.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/793tgj2lo2maac1mk7km7krbh3/82606023603.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/nikaxeduwokamasu.pdfIn PDF document text
    • http://emaaravm.net/upload/files/15696978206.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/zinuxej.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/fomumodagikakumu.pdfIn PDF document text
    • https://subded.org/userfiles/file/menorakugisaroredapujut.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/mimijozinazoliwulutegif.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158107f8e761---67876913348.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5b1a5f049---62841225387.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/49287032929.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/43368543532.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/fenefimor.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/23029957907.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109241926304485.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/kekukesepizofosaruvu.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/80470445378.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/zazixenitezapekavozovekon.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/mokesuriwaxokizew.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/15239499465.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/pibinuvafezaxat.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/ziladukirurinevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=record+of+agarest+war+apkPDF 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_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 22300 bytes
SHA-256: 79cee28b31abacbaa0c93bb2cfa770f922264818264b0f8273875c434f12efd3
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 10776 bytes
SHA-256: 925fa9041d15b4c89a15d6f1862dfe82b7d811baa22f46ec49815e7f2fe6cf08