Malicious PDF — malware analysis report

Static analysis result for SHA-256 466d20a7258741d8…

MALICIOUS

PDF

148.5 KB Created: 2021-07-13 21:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94a4dbb84cf1397011ce4893f0151fec SHA-1: 2fd06610359c98687444879cf5abd185e2e7c0a4 SHA-256: 466d20a7258741d81af2f6a05ed9b465c052cf5bf85fda355f6a797dafb88a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 6

  • 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.
  • 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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a176b5bbe3f---nefononu.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/tpe6qvob8671cshl0bbgd3v0b9/deral.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/85226870f4ccec6d62c34c52fa975193/nirifovopifisiwiwefojow.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6173e24b57---1829945401.pdfIn PDF document text
    • http://charivne.info/images/file/44426092170.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/4404e59ff0b5359ca631076a94f2e2ce/kudamivujovet.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/xiwamegubosugikoxelor.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/liwivonukipuxa.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/f2mp1d73q9sja0u5qmq014pr5o/29586000307.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/eojol15sh01eqk1jr3pv3hjdq3/wazajadaravadavudukat.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/24face5b67552a697d4c595d7f863110/noponuzoxuram.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/80327528250.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/42bb3b7d551276714452723c84209103/38710126121.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wisuzidexatan.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/35638978848.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/wuparamuzobizuza.pdfIn PDF document text
    • https://stvorki.ru/files/file/72657333506.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/waxirezazewuxulofaxor.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/84561892819.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/571a94a38055e686a1f910e6be4bb9a5/nuditolujodurubo.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160869db4e730e---gigodukadizujaxekanod.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/90731520476.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607586b8ad14a---71183677075.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/31464843614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=substrate+concentration+and+enzyme+activityPDF 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_off0001c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C485 21304 bytes
SHA-256: 7deb47af71c54832c0188034be817a5905c61a3c5a87d18f8d8659d951468e78
font_01_sfnt_off0001fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2147C 11040 bytes
SHA-256: 43fb379aa8b9d3a2c93dbc5f4a3089bc53b18b05780efed324b27344733efe2e
font_03_sfnt_off00022e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E40 16180 bytes
SHA-256: 5fe250aed078d0ee0c8a6eeae28bcf3660a94536c0a26c91209d7ae7f0165d2f

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