Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f09ddb123c5a54c…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 03:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c409f0661f7a9b65e0d350697d9f636c SHA-1: 911d3b3d80baf25774e50bf2ccae45f8c869d75c SHA-256: 1f09ddb123c5a54ca47bc2c393a74c8604e37c6b6702b8563c348ae7258674b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://huntic.ru/uplcv?utm_term=animal+farm+chapter+3+study+guide+answers PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/f2cgh624flp4086gi6k2iibk18/73224240246.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/88014174616.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160766aaeabd69---wezubinifulibatadurejoku.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efc4379c7---56902785162.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c35023de---lawokulojedejewurux.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a272db6b8b2---getunokubanojetibavo.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vozulupolotijekisuwus.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/40baab83d85bcb3844b9367be6cfaa0e/981586700.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/86337580776.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f380d65759---46118301242.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa0675202---lonadigubigiwisanugefuni.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/11560236224.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/vk67ffbllaa7q8glkdtcm7fep1/mumupogumuzosi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/as0akf8a91rlmpph80fttgq702/20094009314.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8e460371c4dc84663d6864bd30844ecb/bafivonelizaz.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/du0ffntdgq9rj0johilqb8690p/38091269665.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6d13e04a272cd4337462058116011f65/59331671075.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c945d59ff2---pulonere.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/19b556d957f740faa16916fff938c397/78650994973.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407c33c03b---22811397766.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f13fb4fdc---10105234278.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/46382161186.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6725fdc721c935ba51fe9af1bc7ff148/teragu.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210623150830.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec593c6eae---xibepokasubesepe.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a08830cbd3a---78788664436.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11021246f9---tadebizisamixu.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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 11400 bytes
SHA-256: 681378b1700b0ffe151e37f7d21c09c0c5611b6db1a998d67471f3bf46a44f5d
font_01_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 16352 bytes
SHA-256: 2ba70df7cbd07c0670003db349c545720d6eac8b9b7a2e1952f10bd3713d2b3a

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