Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc860a51954528c…

MALICIOUS

PDF

83.5 KB Created: 2021-08-15 14:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd2933f990d16d870a9579652b5a65d0 SHA-1: f73ec7a0eaddf2881b7bd165fb0da0668f6c0377 SHA-256: ddc860a51954528ca7049ab7f7d2a873222ce686eb87c4f32299b1c70616cbd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious or scam content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=after+ccna+which+course+is+best PDF link annotation
    • http://twtipa.com/upfile/files/2021/07/05/44546155858.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb48b1ea58---73900190750.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/netegu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/htvh3m0d4scm2k0b54kp66hfb2/64090620198.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3trn1u0ltqk09m69egnfs5hade/45870186056.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/77869405934.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/diwebo.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/15730421375.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bbd308023f3a71b3c370dcf05cca2c58/wetaxekurufiw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9ffee8b58---dibimoxolitobavepirev.pdfIn PDF document text
    • https://dineflon.com//files/zowegi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d8a86ad9---vomozatunegeloz.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/22898420618.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/xovejopom.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/12296649269.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/zevigibonu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4016a292d264362efe7a5b42191cdbe7/79680591066.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/26d21b8c6fe357f8793deefb28f89b90/gakamurawege.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/mogiweluzobajerofupib.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8284e4a4---40810300466.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/wilig.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f6tef21mobhm4o8tcjc3sbjm9r/nadajuzedaketunogodojede.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/fefejedelamipinowojixefe.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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 10692 bytes
SHA-256: 71777a6e02ca02845ff8f5d51d19becad04d4316aac502d76a533738e16536b2
font_02_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 17272 bytes
SHA-256: dda03ef8be1cebf9b5ab77dbcdf183792b31912027abee685397ff402d78338b

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