Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca02a6404530e2b4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 00:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5622e11b12bf960f4f3b7706e9392ef SHA-1: f7b9c61837796fcc511337949270180d3434f88a SHA-256: ca02a6404530e2b4ce78e64a3d7b038bc3bb9398d80ec9fb2d9b98b0b2775c65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to obscure the ultimate destination. While no executable scripts were extracted, the structure and URL patterns strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://axiomestates.com/userfiles/file/sumivizuxoboretid.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f4102949---wularelafiluwakinuz.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/91976972424.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/26458141871.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/xadewalizarapomuwiremejax.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae33d969f---47857908182.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/13056250199.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/j9j7eq860j607o4p49fc156m9m/65321237568.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vugefe.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/41137558405.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dukubelidakazoxew.pdfIn PDF document text
    • https://superpart.com/files/11212400271.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/jirusokebopeso.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160770a8c926c9---66174038153.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d22e84000---18831566701.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16286347794841.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609457ad402c7---fovijajurogiwutibofewe.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/90750460998.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094882c695f9---8518255660.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rj30qmst59qfucmav7p7fd8lg6/vizofupozowudofuzuxemaz.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/45863981592.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/60776568326.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9187c9fa---vovujimer.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/kugapanuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=missing+addend+worksheets+subtractionPDF 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_off0000b8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AD 16604 bytes
SHA-256: f02aaa9aa824de0147eeb0286d324752ca34665afcc446f36bfb5c6171c5950f
font_01_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 11012 bytes
SHA-256: b01497a3f904faeed8b2de9ecbad4de6a296e91cb34c5ef27251164ae18fef62
font_02_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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