Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10298e81b9dc8a6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 01:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0447c5ae944090c6d18d9b7b8cded13 SHA-1: 210b7334d18028f4e3016f879bc58fb8a4dfc2a7 SHA-256: f10298e81b9dc8a66e6127bbc5dc0710f7ee189cdeee5187158ef67e5cb7eae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=periodine+cheminiu+elementu+lentele+pdf PDF link annotation
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/gibukakepugujemu.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/kadisimatefimolava.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102538096b7c---vegazokomumaji.pdfIn PDF document text
    • http://change4best.ru/upload/file/wiripebababigibege.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae102e18afa---diziz.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/tibogu.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/wefadupujegaxuxope.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/taled.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9831a5492---10164463856.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/dusadilanutumuw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cec23be3f---73831571848.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/wujejeroriw.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e63fb87854---40084843353.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/guxelugebikap.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2d6e81c2ec5b861a4bae558adba99b48/pidapejav.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/jameruzigodizaxomulafidi.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9ecd0d9d8e60037a93a70426ff817aed/mokuxevuxisavojovaz.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/726qf5vf23kf82v349hurpu5pb/22245161741.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210806_F663BEEB807878BE.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ebb068a9---75419230664.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160874ef326c9a---bawip.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/6464419275.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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 18796 bytes
SHA-256: ebd68e23578ed85bc88ed92eac6896ee499ad77d4a39f91e9abb8c62358cda52
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 10656 bytes
SHA-256: 4f06908147a15e0e09eb5baa76ca3f1c4d6bce3e158e069762b2e8e045afc8f2
font_02_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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