Malicious PDF — malware analysis report

Static analysis result for SHA-256 5757bbb3179df341…

MALICIOUS

PDF

89.1 KB Created: 2021-08-09 10:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 401a03a87b1b4b4f09d05261af65f576 SHA-1: 207913d440b3c8a98189a67822be3e5e43057d61 SHA-256: 5757bbb3179df34144f060f671df4a7c76d77f806896bde990497e33b01c4a94
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect the user to malicious content.

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 https://catamma.ru/uplcv?utm_term=records+management+plan+template PDF link annotation
    • https://chiuman-hk.com/images/file/dupuxusobawikezona.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/sdr66p1tfv2n15tl8roa7pod7a/99822545236.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/65799015004.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/jobatobifadatusemurojob.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3a144258cc557b0d4e6ef5b96e531b39/ripopigivi.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/robafozizagoj.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1745ac87---bululipo.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/muduj.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1b279f7e---xivazamanajajojififik.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/mofidopikarugiko.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/27829328462.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160addb6105bed---88505030544.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/24998374338.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/10611404960.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/merumobe.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/63907504888.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/93310745521.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///81602951487.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fozagilorafojisuj.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/61bb24a4f9ec69f1add1a7133b494123/83448201694.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b66ce9597---37890771945.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/sezujojof.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/jigubogiwapagizafig.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be009a628e1---66052255137.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/movobedozivujizelikar.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb28ce0ebc---37834207747.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/36508931759.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_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 16544 bytes
SHA-256: 46c082c2d94c75ec84bfcf1c2244f76b2630cf24f830cbfc88e2d8651da23ffb
font_01_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D16 10812 bytes
SHA-256: ea45d99acb19d53e2623fb739f5ba7539cdd501976acd54aac49c6271ab189e5

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