Malicious PDF — malware analysis report

Static analysis result for SHA-256 624874505f055b6e…

MALICIOUS

PDF

97.7 KB Created: 2021-07-03 01:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5773212ee63c5b83f56357f0dca834f SHA-1: 391bbbcc354f5fa24decee65e94ac2c640dbe7d3 SHA-256: 624874505f055b6efffc754c816ba94dbab333dfb6d663cdf40c905041b01ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. The presence of multiple suspicious URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://alexhofford.com/temp/files/file/16627358056.pdf In PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/wuxaveriwofigevigopu.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/manemodukaribasepaloju.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075346b7a854---pevapudijodiwojobefipaja.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae39d52cb---neturapaxonaxatekejugo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6l9d9ne0ghl1rk52bnoie8heef/89229095473.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/53ef940549267c737442e10af49e7017/38966939188.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9b04af16---bekadogesaweju.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/44300800112.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1d721c25e---famiman.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ab48a8234b1595f45bec95e9647b0c64/92245788862.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2d46f5ef127dbc62af197ad2bd017906/fijetijukulevake.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8621fc009b3084266d5266d44da17ff5/16401533755.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608901f26e951---paxiwasorizupanaxip.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a17c4edaf6a2c6a9ef123d6d79db2040/faxukibiwa.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d2d89f0217a2064a8763411e568a9055/zonibepexofapozunula.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/427387919.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/dfbd3824a0f227c4088b4b0143064113/pisovatotolovaxase.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b61c1cfb2---dejariluw.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160973761d4bba---nidovit.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f58e43accd8bc514097156c18eb6c738/simimirumatevelewu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4a73cd157c06d619be5c0c30cec183f7/medoxowadabotinar.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f58ea1af100b4686bd8a98639b36810e/kemodozafajod.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ph7bpi5ssggnmen9jkcl5cvv30/kodopefafekufe.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b79567d7---wukokakixowukawepor.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/nupali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=period+cramps+worse+after+c+sectionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 16724 bytes
SHA-256: 4be2a33a0b54bd404f98add7c8ec9b04f8d89254089c98d06809def1cb530722
font_01_sfnt_off00012e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 16892 bytes
SHA-256: 7bb558c053dc4e043e6ec2b99395c9865f054a5c24d8cc6c1cc1224a35179b35
font_02_sfnt_off0001462a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E41 10820 bytes
SHA-256: bd3261917c77e94008c38eb5a98e273549ebda42b100f2379835d4ffa0f304b4

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