Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f12ac07fb8648b…

MALICIOUS

PDF

98.5 KB Created: 2021-09-03 08:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bec1abe7a0f60bd3c32df42f105eb00a SHA-1: 56d9a638a84d007be8b40069ffed23285f2dda00 SHA-256: 82f12ac07fb8648b34bbdb4a1a34270aba04f30a52cfeb4fafc0de0e1829d7eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to external, potentially malicious, content. No scripts were extracted, but the overall structure and link farm behavior are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5d58af29---74123768836.pdf In PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d257d7928b---mumuxubisefopikemuna.pdfIn PDF document text
    • http://weingut-suppan.at/files/woxaguwegenaguzuk.pdfIn PDF document text
    • https://majubesar.info/contents//files/nadaditojimasediburaxogep.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/68226654362.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210628122312963.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/bijibokajagekoxe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/834hgf2i3jbvps003cjmcin34o/26511847279.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xetolu.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/posepufejugaw.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jurekio8pma81bcmk0du82cvap/30685609378.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/71605401896.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/tumilodupakowekidixite.pdfIn PDF document text
    • http://starsunited.at/upload/files/vogumupi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64e4f4faddb4cc3d611c80d3f8358557/bulap.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/41865451618.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/60073756073.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/saxupexavozerobedofo.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210529_6B9E96ED7AE2A2F2.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734d4ccf26---93252603809.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/sugasilafozurabejepijur.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/nidom.pdfIn PDF document text
    • http://delve-cr.com/uploads/velimegojuvivavenedomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cain+and+abel+story+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/92bbedd4c2faf61f1e426c98fa8b17a5/84043402751.pdfIn PDF document text
    • 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_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 10776 bytes
SHA-256: 4c6a2fe9002d10af675b35726e6642712925e6d0b21cf09d263767e4a6071cf8
font_01_sfnt_off00012b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 21808 bytes
SHA-256: 487563c0729502d76ef6757bccdd9265e87bcf0cf374194aed6c5c22f7311f50
font_02_sfnt_off00016465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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