Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ca2044e92228e7…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 00:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1dcb15d4880995d7132d7e271ccb8ec2 SHA-1: 1b61850a35d41cca5c9ad1ffe504be07675ace3b SHA-256: 51ca2044e92228e78e10705d4f3cdc7c224c49427fd6c0cbf46b3d2b8f299d7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to websites, many of which appear to be hosted on compromised CMS platforms. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://bamfieldrental.com/userfiles/file/10621026062.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca05e9f437---26799536091.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/lulepizejimokonuli.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/98875607900.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/kodirejoxakup.pdfIn PDF document text
    • http://wwstationery.com/files/file/nanidesomiletuki.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/67066763153.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e0be195f00---merologakanobejiwupu.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/xomejuvidumuzopenuvej.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/50974265049.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4210aefb5a---xinixivujetiv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42c51f0e5c21b51bb9e9760687b19b82/56650888172.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/27650785927.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/85806541577.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/jukagobap.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/kefikapupawalarizon.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8efhai0mqueee923e20s8ppick/80365452446.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/safarenizanajuvejufoge.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/66813506199.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9be7cdf9c5552acd73672cefd6afa51a/29767121179.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zoturawokisuvisumimizozas.pdfIn PDF document text
    • http://vititanon.com/user_img/files/51565663954.pdfIn PDF document text
    • http://markone-tools.com/upload/files/68933957045.pdfIn PDF document text
    • http://nktrading.qa/file/files/gamowiwabepatinuxutapij.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zezofilosuvujuser.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/30246075684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=car+cranking+but+not+startingPDF 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_off0000bd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD25 10588 bytes
SHA-256: b09b17b85af6c341b52eee256921a9e8dbedd88962fcc62bd3d067c73f0e475b
font_01_sfnt_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 14612 bytes
SHA-256: 3ff2390301c09fe0ba4a58949fdd60c47f3bb639cc71967b221e5fad07b1ca17
font_02_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.