Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25673751f90f945…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 13:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35277e9bc80c266316ae474186d5a93e SHA-1: 132f2ddb1f2555d8234926aa94a9ca0d3b53d2e8 SHA-256: a25673751f90f945849c39aa87936c0811d6acabf986e2a123462479e9fba887
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious destinations, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://boki.hu/editor_up/74633592110.pdf In PDF document text
    • https://gikguamerica.com/userfiles/file/bolukatago.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/zujakidaboluwonimo.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/3831614164.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2mittaps2ovf580gjni3nchvg3/tututibunesefajetofov.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/44986371370.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/50512727336.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/52083330823.pdfIn PDF document text
    • http://suurelepa.ee/data/file/25570577799.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/60970329380.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/vililonuwoxolamofo.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/kopolugipujutibisaz.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/kofami.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/50016856381.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/91668784f9a600f2322ff148cd55c87b/kupesit.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/511c41f9800ca82ffde15dabfad8c507/mumutevasego.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161468e67d96f4---56056053920.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16144589c12ce6---ruronusijivaw.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/pifof.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146cef812de6---munumati.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210911132107.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2ab662c9cb6c48e0b0eae12ae607fc39/41506689346.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/wixedav.pdfIn PDF document text
    • http://chinalabware.net/d/files/54524553699.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/popuduvuvezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apps+for+watching+movies+with+friendsPDF 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_off0000b90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 11156 bytes
SHA-256: 858c82edbef3e21aa4a919f8b53bd474b5ab36a0117114761d8de86516ea37da
font_02_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 16056 bytes
SHA-256: 5d84890281a020c7d52f329cd87b869e03e0c9bcc119dc393cfefdea333d7d97

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