Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d56c1c126a3ee26…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 07:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0af60bd1a9e297fd325d1385c014e764 SHA-1: b91e24935cc4d23f067502581d61d9b12e876fbc SHA-256: 1d56c1c126a3ee26f92e5eafc4b4023655e2ea7b49fa01fb319b00dbe7214542
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jar-ted.pl/file/viromu.pdf In PDF document text
    • http://thietbiotoviet.com/Images_upload/files/73894952442.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/fazumapusulu.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/10567635232.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/55839010951.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/xemaxefuvoxugo.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/wodejamesezezakozabuni.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bde3b30e---57736874470.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/81694272902.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/37409919371.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/79269644049.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee79eb882---8741713895.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/kamobelaniredufaw.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210909001718243876oosfbypp2ot7.pdfIn PDF document text
    • http://moretonassets.net/userfiles/rulereweropejosegitutaj.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/ladebamukudavukerizoju.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/74811078881.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/xezuzebexetupitowilu.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/96906188283.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c8fbcbe3a221d53898bb243f83caf0ed/kukolegadoxivamekalabades.pdfIn PDF document text
    • http://juha.be/_files/file/24374493438.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/zunomixojezilofaxunarize.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/59370442184.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tekumuvinuwajedafumoge.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/mevibogutorokumewekilifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=touch+sensitivity+note+8PDF 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_off0000bf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF48 10468 bytes
SHA-256: 39d1248154bbb5b8eaa2dee6cfc9d83ebdd901c600f1a5328365f06a23c5ab85
font_01_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 19096 bytes
SHA-256: e48709e367fd65533445d86fc82dd02f6af2d835f4f38b81b4ccd40f8dd94c76
font_02_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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