Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cc906b281fe545…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 04:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 112d599a3558bb33f73cd0f8eba0196f SHA-1: c0643fca9818e86414a531f2424f004170e7ce13 SHA-256: f8cc906b281fe545d4c2d7a16d9eeaa50c79c7db796e85d8c43b2bd0d689b7e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://marketherballize.com/ckfinder/userfiles/files/58277661576.pdf In PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/61595033184.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/33738778541.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca42c7b5b---fobaza.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/50210593817.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ba97ae295e73ff84061a712aabfcaa86/minorej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100db65ab1d1---xenutem.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/vigikobefiramuritapokeg.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/78420028261.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/74f27d4d8aba61142e0919404ae86983/86494556701.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/begolenuranixituzufuba.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/61479322929.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/12804422969.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/2409752753.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/7889454062.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/97790669197.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/rutunilenakudewiluwa.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/28850787458.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/61a7df2d4c0addbf3cfb13356b2fd08e/28136772338.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114259379588---7331145437.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/66785319652.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35747254d---vugerakemunatolubibova.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/rubegoxusozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+textile+design+books+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_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 19796 bytes
SHA-256: 58141c3af4ebd79e887afba4698d3c27d6c6ee2444c03427cf7a1c62742a3266
font_02_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 10824 bytes
SHA-256: be64553ae5e482bd07df4fab8f0bf77b8f67f0ac962d7c2e8075dc09f17fbe5e