Malicious PDF — malware analysis report

Static analysis result for SHA-256 c262be66b8a86fe9…

MALICIOUS

PDF

83.0 KB Created: 2021-08-23 12:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab567cfe436f9c60b44c67268c697523 SHA-1: 5a05b569e5095d3c59cccab46280c4c953b89c1b SHA-256: c262be66b8a86fe9968651b17819d50e866d5e2082b56382950cebc06dc66175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=2nd+grade+addition+and+subtraction+word+problems PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079107d2a93d---58580489378.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19f999f5ea---nuzusupuremebiro.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/024a0bbb6f7675b3a83243760ef46771/tozotufepajej.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0a80528e---webusudejedukof.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rvf7e6ttdvsd1tqm3c9j3gd958/memobaz.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rcupcki3b3e4cn0a13ne3mtf82/tegeduvavamamorerusu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dcfd50e7f---zelex.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982559b7761---25277548172.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c982f27a5---vovoxegoline.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/wivubisonalipufo.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/70876235992.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fd3e9ed9a3361c28235edcc879df38fc/nogekujadotopekenowiwogew.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/27588257859.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d19521d8237---4948015731.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/sizegagaxuvusamogib.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nuvevitavemodofibo.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/77409170764.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1cc6dv9ru4mipfvmh6mqpnsvr6/53282467463.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/30994714787.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/5204320808.pdfIn PDF document text
    • http://www.bandungmesin.com/file/fededit.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/36537557085.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/49779826139.pdfIn PDF document text
    • https://salwangurugram.com/files/31511347224.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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 11208 bytes
SHA-256: 597864c9c19e5d8497276bcaa302d57f003cd6a4bf4d9d737585404e1b7fd28e
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 20160 bytes
SHA-256: d49aede04cdcaec740cdbb8bac3d5358c32bee1089a7ca228be91411f456965d

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