Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bd1b964e55afb7…

MALICIOUS

PDF

88.0 KB Created: 2021-09-16 04:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e5156c67eca6655abd033167a5cec3c SHA-1: 3076fcd0347d88200961845ea3c0218cc8afddea SHA-256: f6bd1b964e55afb7bcfea0e2e5bd7affeaac1c1acfcccd26290039a39e4a16fb
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://allytemp.ru/uplcv?utm_term=gps+setup+android PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a431eec71---nirisopaxelura.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/14811482046.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9cc8ab64---61338966173.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e23ca676---nagitesix.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/80423969361.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/kasalegojezoro.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8db3d22d5f94de5e4d8af8afa7d48e4e/wakimenemoxutelaju.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/67675670022.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613764adb2c00---pokusukoxedanewosowef.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/51001576712.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/64937483208.pdfIn PDF document text
    • https://superpart.com/files/pusekoxibunepetusim.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/1034565070.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/pizitudopizoje.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/68570347121.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/sepobixivevizazitazopofup.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404d2d8b9fa---65652327650.pdfIn PDF document text
    • http://qwerty.pl/_data/file/mifajogemopudexaloxezowi.pdfIn PDF document text
    • http://ruihuitax.com/files/file/70764151259.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/letanuguvuzoxumax.pdfIn PDF document text
    • https://sergiomauri.com/images/file/26203969327.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391ba24553b---tavadapariteliwe.pdfIn PDF document text
    • https://jensbrode.de/files/file/kabunibetorejupodine.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16132db583b644---88763799315.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 21616 bytes
SHA-256: 4e3c41ae9bae1c688ab253634c9088f483bcbd37e8a659b6c965b9b122a61bad
font_03_sfnt_off00013a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 10480 bytes
SHA-256: 070855a6d26116ca05d188d05e1d16602eb1096021dac62013f2204fe03c401a

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