Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b7a6eb83b40795…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 08:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 393436ee84de0bf0a8a447b27c80f04e SHA-1: 5cebcaf5f0d363d2b2796ac8bf1a8f9a1941286d SHA-256: 95b7a6eb83b40795a0dc736fe24a4b155d5b26dbede6ece51773565fbe8df3b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, many hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly suggest a phishing attack or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://thanhlapcongtykiengiang.com/upload/ck/files/wejuvofotopozo.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/983a48f6dc90e16b1c2e6aa8e4f9ec77/40940450277.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a67928311---zuvebelibunilif.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/42751036803.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae741f0a09b---zujogewarewiz.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06855ef6b6---30624372800.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/49255488247.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1537ba4ca199af014e5c65f4ca726782/9961432927.pdfIn PDF document text
    • https://argumentua.com/i/file/83176871285.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec0a78465---noxanivad.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/vodopugopevibi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8f5cc98c---33899032708.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0304f289---wuwizesad.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8c6eto5vl4rb5nqo21js45s574/rufejud.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/donakijinepodozat.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/kqs0mh9000h0sa5mn2tnj5hfsd/sikoburobufewubujoz.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/fafibole.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/befusofolopa.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/j9t68tlruvjjb8fa8bn2pk5202/kewunufilexivireweravaw.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cb8d59f9eb511278e4fad3f9ef9854cb/37386640984.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/semonotujaru.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tokiga.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a99fc6221fc---lopivojabanodu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2502fa7b505c28e31cd02536fa66b165/romomirexapolivemo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5ff67374---xenetedolazizetitediza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=deepest+river+in+south+africaPDF 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_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 16740 bytes
SHA-256: 51ad5ec28b4887eb6b279c69e14d9b8ec96ef23cd61fd6616083394f758f6349
font_01_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 10696 bytes
SHA-256: d5b2147364e7117936ffaf07efb29fc55f3fd76b293f8e27333cf6550d5083cd
font_02_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1