Malicious PDF — malware analysis report

Static analysis result for SHA-256 47335132dfbd3f15…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 17:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a05abbff93e6e74cb9ae44ee51f3bcda SHA-1: cd8541b52556b9ff7289cd5891bde891f168474d SHA-256: 47335132dfbd3f155b0c965b3f56d3cf03653577f3645bdd687e6959696c9021
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=syinix+50+inch+smart+tv+review PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dehg15ko45i98fivnvnol4sapm/vujowafaxegeta.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/32605052360.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210919_111231.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/xosolupaxe.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/65874416991.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/50012229635.pdfIn PDF document text
    • http://czminghe.com/upload/files/bikalomasenanemafasubub.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/kujikedodifaxagixajitu.pdfIn PDF document text
    • https://10fci.org/userfiles/file/sijumemazutem.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/98589876464.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/696bef0f5715ee8efb393958b04034ad/gevuk.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/masijatojeburefesaxede.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/kawerujibel.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613244144bf35---zuzomegikomi.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/86580380728.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/ketorozek.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b86119e13---79931055223.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/7604431976.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/dujutexosikezupo.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/davufikuluxisobunako.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/bujekapupuse.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/menafakutosuxupoxa.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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 11028 bytes
SHA-256: a32d15c09a7bdba37c557fa0f64e2e01c7b0501021c83c921a44bb4f4574f983
font_02_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 17728 bytes
SHA-256: e0f96198381263c3a94a5d52be005040c0cb75e7a9b3b5976c534e21bf8971ee