Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3947088b8e4645…

MALICIOUS

PDF

96.1 KB Created: 2021-08-28 11:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4407cd628447925a46e628a33640f6b SHA-1: 319e326583335097503505f8c01c3fb299740bd3 SHA-256: 5e3947088b8e4645fb73d72fb9ca9d218590d5c82467c3afbd8adbdac22e2994
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://allytemp.ru/uplcv?utm_term=19+foot+speed+boat PDF link annotation
    • http://sure2trips.com/bot/ckfinder/uf/files/73554393256.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/6536ab3ccf5829f66eb0b84640bb8396/jivavifone.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6f04ba5bb057e996bd975710065e6080/wogixanomewasa.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/013b065bd23e64ec97cfe5334c8f6a19/69674780512.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ul2h6q5suaqle0jguhr3gouoes/mowekuvofimiwajon.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c41e24cb9ecf01b6d0b72aac00bc1633/82623729957.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9a8joh99nlifuhbf4n2qi8qj02/86647509768.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/60740834.pdfIn PDF document text
    • https://songhong.info/userfiles/file/tigopikumilozagazamuvu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/11877794726.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3859a4b79---fazilolasalunusuvuroxaze.pdfIn PDF document text
    • https://digireg.dk/upload/bawijaroferodaroj.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/81117430286.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d31e3be086cbe0be1b31173017484994/ribafowirenanurowiraba.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbcf99836---pululapaxesajoki.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/remodeduzim.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/fupopevex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125db70b90dc---kazupujituwadamebil.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f8694202---60161607524.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/faxanukezuva.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48f43882d---90625016532.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/gikalivipexujip.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8aa01a2c6---xutakosoxibazibonojo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e794a706de1---99315151717.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_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 18468 bytes
SHA-256: ffc92244901104b2d88a4d943c9c887775c383195080eab317795d079ec33eed
font_01_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A72 10412 bytes
SHA-256: 4c739a9633ac552fc27d23addbf0de9c8440b12a45eee69899d11bdd975444ff

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