Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb95c94d3e5df159…

MALICIOUS

PDF

94.1 KB Created: 2021-08-18 12:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a4378e8da63c50ad3928457c5f39399 SHA-1: 0dbaf6911b1d218add4347f77f9306945b5d06da SHA-256: fb95c94d3e5df159b6acd4a48de314e3d17bcb60bf1c56fbe732ee1a5d95076b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external links. Many of these links point to compromised WordPress sites or disposable domains, indicating a likely phishing or malicious redirection campaign. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://al-bandak.com/userfiles/file/37842872323.pdf In PDF document text
    • https://scavilecis.it/userfiles/file/31270603604.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/sejuseverafujigo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2fddb6bc---41938262363.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/fd92c9a5a77421228bb1b7e2c90c1437/pazogelavezeditofaxetime.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f20d25d0f1e---21385589098.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/b2kbma7qpqfpgon9martfapfv8/godikofiwinivopavalada.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/r5mafrt1rmbsmk6m6v48e23pu3/jusurowonazomak.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/ratoriburitijajalajin.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/89862484720.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/001265ef10aad6e71a3b62303ef662c5/707131367.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3b07f4def7a3133cef25cfc05b89322c/3002944468.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/98841071151.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/76194073493.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5qmki0g45stdb27prqdrit9nis/17904967059.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/qpj9rl9ui66tqeco7vm846gv4o/zajoviduravewivokul.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jezurowirazevowir.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987686b0cbc---rinetujoxipuz.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/84048606661.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c423fb4cc3169154d9ff6ba6e7f31b33/95775530971.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/sonifeguto.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/vulijisevojibut.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/kesurumewux.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160780b3c90350---77888376955.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4b642dacf4f0e180750bb60b09a5e6bb/viximolezoris.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/59397790853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lauren+graham+talking+as+fast+as+i+can+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 17028 bytes
SHA-256: 3bc74f1bb6ca449e776b4f6fb3bd120cb2c5d5ea79d81e7d6a32f18d1123aee7
font_01_sfnt_off00012004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00014e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E21 11096 bytes
SHA-256: 4684df481afa7c6b5d81cef287115824b929f4c14e16438665d41ee685f1fc45