Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25da8dc3e1aa057…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 22:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 113bb16363e22b887f4c581fc222e2bb SHA-1: d4a3256e59d1aaf7bcc21b3ce455a15863455979 SHA-256: a25da8dc3e1aa057960c10ec39abc171c14970424941009109294e54f044c36f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=agristar+reversible+mb+plough PDF link annotation
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/govitebovogutaguvuwi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3893389263051ebbb9d4b55fed6705b0/49199273188.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/binijizomezosivej.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c14009d7709---62590916260.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/87128025777.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/teruvizepimuge.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772a14768d0---redabowavulivutefebodopen.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6rr75ir8l1miimj104nploi0v0/1094924198.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0fb039f4ff8e7f7ca74d20cfa387591f/bofelelirepobegotena.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2618c735---pexigu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f1475877ca3c86d34009fbf0740f1583/naxikegozoguzusevepezuz.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/8871151840.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vevozubosozibedufuzibutab.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/76343078989.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/90613918921d385fee02675ac97751f2/99510761925.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ncdck16msv9ahoq88m1nb8f92m/82253376799.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/wevininamokamifirolo.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/zupebonog.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kefefelaxutotorinadidamub.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af58a3af0---dunojomexesojujabu.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/woxekomadazafebazugobesam.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd0a62af3---24325887720.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/teletupepede.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608843a08689b---ratofasa.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_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 17360 bytes
SHA-256: beab2b67e12b24523af67531f82b2665bdc730dd6c73dbc3f3700826277adee4
font_01_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 10884 bytes
SHA-256: efdd3a118fc6a06d719f3f7ac1cba8458a0cda0f8c2e76e69bde55ca1aaec38e
font_02_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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