Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbf263f72026e0f…

MALICIOUS

PDF

86.5 KB Created: 2021-07-30 06:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed0ae43ff4bc6f7a56f582c40bd26235 SHA-1: ffc602528612f4ca8d0a9fbc197987c757610cd7 SHA-256: 6cbf263f72026e0fa83b36e76bc38695c27b36816aee3e22d34febfda042f7a6
164 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, many hosted on compromised WordPress sites, directing users to external URLs. The heuristic 'SE_URGENCY_LURE' suggests the document may contain urgent language to prompt user interaction. The presence of embedded URLs and the nature of the linked content indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=cmbok+4th+edition+pdf+free+download PDF link annotation
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tdothokh25e1upnc8nml2o1lm6/pajuwososefugen.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091baecdfd1e---jokagebalimuwigefarux.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1q5fc7kk9nc44aqiu5ju1b97m/tologuwu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d78f7c02811---daloxelorugiterileregi.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/lozonegukovepidipo.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/856b321d87308321cee8086f70de3caa/jobakepederamubapuj.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/67d93f9f03a4d77ed5185b6d45bfcdfc/saluzikirukafefafar.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/c5lt09gdkvh5lkhu6d03ut54e3/talofuxunex.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/59221765550.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/tlsjo39ffj600eqcv3f97mk180/63439925197.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33baf05a7---26832847441.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/8107954519.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8e46341ae---faluzidib.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffb2dd997---kegiviladilo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/zafugavasunesem.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d08b4e88e5ba9c1d097d2fe2e9aa9215/410464808.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/rovoruba.pdfIn PDF document text
    • https://bamor.org/userfiles/file/63581259853.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160925fb904fc0---1478737819.pdfIn PDF document text
    • https://ckmandarin.com/uploads/77002374731.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/93656389707.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16083021a921ab---monekugezizuvufexewigofog.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/63461826211.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/46968031835.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/pupugiparak.pdfIn PDF document text
    • https://airshow-bg.com/file/88812690739.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_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 17248 bytes
SHA-256: e88029b882eda49ac94b1dbef22ebdce8f2175440ec767b9b3384bbc4a8859c9
font_01_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 11024 bytes
SHA-256: 9cda8def9d1a3a366248a05deca563a339bcbb7683822ae1717f62f78cdeb747
font_02_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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