Malicious PDF — malware analysis report

Static analysis result for SHA-256 1010b30f2bb0cf5f…

MALICIOUS

PDF

204.0 KB Created: 2021-06-28 15:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 21cb1c624db2dccaef70dba325014f3f SHA-1: 0b0ac127245e339f4b71f4caefb0716f8f846c5d SHA-256: 1010b30f2bb0cf5faf56cbbaf6aa84f7c571621d7e479f19e9495634f2e7926d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits malicious behavior by leveraging a link farm and SEO redirector to direct users to a compromised WordPress site. The ML classifier and ClamAV detection strongly indicate a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links and the nature of the heuristics suggest a lure-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8931

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=what+happens+if+you+have+intercourse+during+ramadan PDF link annotation
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/86969216197.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2ed1b8fc1dd5e1f530153310e67ada6/59633858205.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/xijufujubalagadawut.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/91433912370.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/ketozajekevoravujewavepan.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/16736893911.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f8938f3f---60031514842.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077e16b3ce61---bokeba.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bcd146542d88106a4e3924e0c3247b10/67159199162.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160763eb0d8a54---194521132.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/zulujosagimofakagaj.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/wasokoxaperokaxasapot.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70e19e642---telubifasidevu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b1ed705a---zurotivotesimazene.pdfIn PDF document text
    • https://mnlex.it/file/juwaketi.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/73310504729.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/rojozojenuz.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/77695520347.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084316b79390---kagumimibu.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/16059364226.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f0b6547d---70137043040.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/44872457969.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/figetofazotitixowemelasi.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gofebagavututotowapufawep.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/92459752739.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0002b8f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B8F0 27824 bytes
SHA-256: 5df78beee30fa69447da81ce30e1641be5e57d072d74c95f57cfde191592fb46
font_00_sfnt_off000286a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x286A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00029eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29EB9 11292 bytes
SHA-256: dd466855ccd856f1725f6f725ef34d10184c007ce4a6f98c1d6ad78501e5068e
font_03_sfnt_off0002eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB9B 21212 bytes
SHA-256: 4f75fa55730e88dc3de8dfc14037433cff2cfe81d521dd76d5846469bd25d71b

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