Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04bd17d112de13b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 18:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6280eefff5f2827074cc1cec6c93dc73 SHA-1: b861b8303ca2dd4b54f21593e49d754106d48464 SHA-256: a04bd17d112de13bba0d3b563138b282c59071a27376597b2a211939ccb74506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://manhchenang.vn/webroot/img/files/40374738449.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/33f25128ad4cdb492c640ad93a63b525/simowaxojasubadow.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tufafelukofomagatum.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613515d65a885---malakidamuzu.pdfIn PDF document text
    • http://mesterek.net/tmp/naxipuxogafebinogugunese.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/rosafiwatuvezebada.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565345daa7---munirupuviwakofa.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6534bfe36---zakit.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8005b3f6a---dafavudowiduvuzewaborapak.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f4d2e43---93316909916.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/buxarexegogumukefi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e9182c8a---46230086709.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/niforupaxekazefug.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6159a17fb---13564990497.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/254bdaf900a2c342966e63131b211798/kekefumiwawug.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/98103291498.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/dowalimoral.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c2782c2dbb664bb978764be1312606f0/12995855881.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc62955962---xazorumelefididorexiv.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kagitenupotumapumemosodig.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c11707f87---gogibopifuliwi.pdfIn PDF document text
    • http://sbairs.com/datas/files/dukibazaxobigogife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=le+congo+belge+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 19124 bytes
SHA-256: ed3deab985efb2e67767173ca6b7162e65eaf3e99f6518e2d6dcbcd3c0248f49
font_01_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 10272 bytes
SHA-256: 8d20f3cd4d372a0a9c260db6aeb499ad326282dc8ac8991dbad5a2cf6b412601
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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