Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c7f0ef6996f504…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 16:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad03d11cd65542ea22ec444466f88721 SHA-1: 1e6b542822995c1dc87635187cf3ba7d7a882277 SHA-256: 19c7f0ef6996f5047018945abbfba2174292e6a70c4040026ea068f04d6cc2c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609621e70fcca---99631177927.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0os8dpjjs0ga7g99m89a2h7225/xidudev.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3fb2ce78---fidavudunaw.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/tapeninuselotopoduwole.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1629d6e7c778c9597886d01715001b6e/413133302.pdfIn PDF document text
    • http://innotack.com/userfiles/files/wimowewam.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c485db27c20---58021085441.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gagozasudironizujo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/badosexogorurop.pdfIn PDF document text
    • https://paperland.bg/uploads/file/pitotigemuge.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/19186743934.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sivamuwek.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf8fb430f---rimulorisuwode.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e7a3d82c39b731202ecbee0cb6f4ae45/dipodakuwukifuwugumuw.pdfIn PDF document text
    • http://pusulacampeyzaj.com/images/media/files/dunefevupuvenoxegolutos.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ac47ac62fd427360df75b2a140dd4d80/tanibafatisusasazun.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/roguzegabokowudazifexojot.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/53150388683.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/sabodaw.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/52332251691.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/30305479300.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf736e15b6---xobilagatopizekobebox.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/18191484150.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/telemopi.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/26470768614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=adding+image+to+pdf+freePDF 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_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 10608 bytes
SHA-256: ddda1f147ce113da4bebba61eb4efe47e578f3fdee4e56724f8cccd8b739e494
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 17684 bytes
SHA-256: e917cda6ecf6651fee8673d378f66e2e0e4a82fea12933b2082226b37f1dbd30