Malicious PDF — malware analysis report

Static analysis result for SHA-256 167f27cf3bd93444…

MALICIOUS

PDF

96.2 KB Created: 2021-06-22 13:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ce34700a31ef9f0feffa966133cb883a SHA-1: de67c6275ef7cb5d4076cc47b88142f790148332 SHA-256: 167f27cf3bd93444e6b9972c11323fe8b383d9380d5bf98778dff9226318e5dd
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other potentially malicious domains. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ceraunavoltapizzeria.it/userfiles/files/45228494535.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/161db865d9a8e91b572acacb37b18587/92539895292.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd7090bb80---44325565950.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ce322fb25---52303564268.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/78078850442.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b669d977984---4553126696.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/2f4bf545769a672d886a6bef7980955c/50573484524.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/rojatidamabonij.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/78457460169.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/898e2639a6191d7b4c19c87dd268224d/bedujon.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ae404b853837c18a4b79c27aba4292d7/bapoxesegef.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/24351620775.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/79936716965.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/84d225638a7d213b21d58ab453bb5013/tolomevewavomaf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59bf873435---75183686721.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fae0b76fee12826531b73463383d684b/90776876157.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210612101315.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/s1vbdtrpfji1da94gda0m6qlug/koxopowojiwemuxabozeroso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+chal+mera+putt+2+123moviesPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 2988 bytes
SHA-256: 546acd1a5a47648eedd65b65f2bc63d7c13a5797fedbece43ef8ae6b2ec800f9
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 5372 bytes
SHA-256: ee8f3b13b05686fd8de8bde0a4c09f45642fb1dc666688277d98a09e2af7d2e3
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 2316 bytes
SHA-256: 5b91c186c0d2506cbb1932d417fe2e40edf424c68f696d43443a27f8f7fee313
font_03_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 11500 bytes
SHA-256: 434c3e29574e7664aa2241a1bc8532c70174d735799c7da283b59528a95cc386
font_04_sfnt_off00014f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F05 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_05_sfnt_off00016434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16434 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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