Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fef7ea2450397a…

MALICIOUS

PDF

170.1 KB Created: 2021-07-14 07:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58ea216839db8c29ea868120844a82c6 SHA-1: 5c7a62984041db31d1983cf48df675dc6ec41650 SHA-256: 98fef7ea2450397a7c66792af9c2e5cfab74dcb1342e37bc6e8819a3ba75c272
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=india+all+airport+name+list+pdf', are likely used for phishing or to download further malicious content. No scripts were extracted, but the structure strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9689

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://krisoc.ru/uplcv?utm_term=india+all+airport+name+list+pdf PDF link annotation
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/01ck9r1iqms83cite1rjki91st/47984999141.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/500f4ccdea03020f555f87fa96c51add/55973624305.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946400bff83---mopinogafoluwadizozazit.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080537ff1050---gopitofiwejazetetal.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4b8c7013a5218d96bf709fe649372c2a/jelusegopolavonelaxowavi.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89562670987.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/27515285410.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4334d4f4a---32083995627.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/32b5ca30fdd9830ff31a850b1e5e8bb8/jeguvawarinatevawipogi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160818585780d2---88980203221.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f3cd77e0---lorawizowuvidenaze.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8d0daa9c502448d6eee362bccf95c7a1/lutegisitorubususufajare.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951e3b224af---7004768332.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f77696d91---zilebodukosulo.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5989d2a0a---18069913394.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/winugijuxalusatadizufegiz.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a09e54fbbade8d8df5098b2e0509b522/33136978088.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607324e9b868a---rewarewakire.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/936f32a64d9c8cf3adfcc8562724111a/muvexumibiv.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210612171319.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/kimewigajiluvib.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/misoturumuwotebajeraw.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oponowajowukanabanudom.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071193df0e32---19588525251.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/55931990699.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4053071295a4acb9177c2ecbc8f61233/87259066529.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_off000237e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237E1 10612 bytes
SHA-256: 044052eec05377119195a6360d643aeaafba4b36861970ee16c5fded9d040d63
font_01_sfnt_off0002500c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2500C 19072 bytes
SHA-256: c74199a1c405e8498a1871fd9302645f3d6f49fa756b320084c1dc381a353695
font_02_sfnt_off000280f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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