Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afa7063c6a62a47…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 08:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7456599d7bd6e312633193d09c415027 SHA-1: 4919e24c24a70f18ba4c01a238c997e21d8fbf6f SHA-256: 3afa7063c6a62a47abff616681425ab6de63e0da269fd0a16772b174fb933a6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or downloader. The embedded JavaScript likely facilitates the redirection to these malicious sites, which in turn may host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511a9ae511---8851162058.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9734fd850f299f4f1475c6f6094dee4e/memutup.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/sexatezewiwaduviwonesulur.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b0ac4f665d16b90f8c6d2e8507ac84f/wenatuzuf.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7385cce0858ea2cbf0d75f4544f19c83/86304095235.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193cc80b1c---39445153039.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/37641164636.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/jijewigufiwipu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607beaa9aab2b---59147152393.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/6600827004.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/gedowepuzudoxefuvomuve.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/52931db5832edb04ad2518ba3b0b20e2/8027683164.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/88520263632.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/n1r25nmc55ah8g7uqjlnkete61/tinaluvegowuf.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/i0p9dkisojg8fk7ofctusl2js3/97477803353.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124f150dbd18---7559019139.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/birisazasudekago.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/jigajanexi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7d5aa34a6926feeb9c6d902d3068a67f/41345670597.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/nurowujatonenikipusuzak.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca0999648---72798100681.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/20686619910.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/22098540009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=netball+passing+drills+pdfPDF 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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 17072 bytes
SHA-256: 4d18d5e17e356e6a480765fc57b1e20d3991453a04cff772531fdb75c83efc25
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 10672 bytes
SHA-256: 1f3b6146d0fdca7fab9af7cd5453b7820424d4c585e898ea68a9c2e6ecaa985c