Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ab79239717d727…

MALICIOUS

PDF

153.3 KB Created: 2021-08-01 19:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e9c37d81e1882eef6f5ff399a1ac63d6 SHA-1: 4d697fd9401700202acc6487f394a78c8eef198a SHA-256: 83ab79239717d727423577aeb019d02dcff6b9f6218ff10900447885ee35b53c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be distributing malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://hzbmsj.net/images/upload/File/58449202378.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2330c6c6d0---gubobo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/brp5tckjplbej5pp3umkpbl8l5/xofamefokel.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4c1791503fad292ed7e6723f0b3f7c9d/11767230630.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/fejare.pdfIn PDF document text
    • http://cy2hand.com/userfiles/siwixomuvati.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/64161494196.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/pivezeta.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878e5d12642---92726238647.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/5431022089.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/79316986707.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096aecee68c4---gogug.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1ce75648---67857826080.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e694644bb---fugajeriranavoji.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/gexopuruliwutasunaruf.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/48108567381.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfab6d3e07---xabedugapikijuvoraxe.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/51914386622.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/2689518475.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4a22a5efb---54386315339.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ls6l45pnhns88pd51ssneg3u72/xorivopapogifap.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947c48a4a61---8248881307.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c620b33df5e---rexuwodudotuwifexadawize.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210520165425811515od0pgd.pdfIn PDF document text
    • http://zimmerei-possert.at/67848095386.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d2f84bc9374a2e65ad7fd8caf7a3292d/sigulagoraropijumuxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=spider+man+into+the+spider+verse+free+stream+redditPDF 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_off0001f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3A9 18160 bytes
SHA-256: 7f28368bb17af13d505c5c2956d05c7a62e9dd198cd6550bdccde04ee6701bea
font_01_sfnt_off00022388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B9F 10856 bytes
SHA-256: 2e967435f2d97b8ca17d5396d2b48edde4f7cef93433429dc4111d92efb6816c