Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab8a41d5f54bf53…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 01:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29c7be936fbed0797074db63119ed957 SHA-1: 40dd749da9b0e2952c13131a444c9d067da84d96 SHA-256: 9ab8a41d5f54bf53e690f9496acdbdf3cc59bb3716c588298d732687b8583951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, likely delivered as a spearphishing attachment.

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://zae.me/datafiles/file/lidebamowakim.pdf In PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/nirokozovaxojowefuninezur.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/doxajikevezexojupujagu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319da3648f3---kivewabibuxadirogulos.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s3kb3724fsv5814vtq9trmk6ok/39606259675.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/xibijuberelufuropek.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/13608920370.pdfIn PDF document text
    • http://davcpundri.com/css/file/xulivowogusoxakekeve.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/wisinufovutidefu.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/vesos.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/fixali.pdfIn PDF document text
    • https://hoavily.com/uploads/files/47522852179.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f48805a89d1cd12f56ad61bf621da71f/6518830783.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/72916738203.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/92574600821.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/43133245119.pdfIn PDF document text
    • http://zgic.ru/!upload/files/vapuvarekamab.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090204500392.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/nibimatototebuzuwemud.pdfIn PDF document text
    • https://andhimazhai.com/images/files/40015230281.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f1488f88---27939708922.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/rafaso.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/35185529315.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/jajolozobozurutiriw.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xedavutonaxopafewelixoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bolsa+mexicana+de+valores+pdfPDF 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_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 20640 bytes
SHA-256: ba7f7f6df9af5f3c49300aa4b500dcb694f4b1eb196790eb5fc1f0ff74b68086
font_01_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 10904 bytes
SHA-256: 0b3050ab9e879cd780dce12707c3346e51f15ae6d9b33ef009b5d584188ad379
font_02_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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