Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e653b0c0d2c6c7…

MALICIOUS

PDF

98.3 KB Created: 2021-07-28 03:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2d4ba5074074c8e5d1c0dfd5e0ce96a SHA-1: 59cb834aece16bba0cca054eb359c35f65a39934 SHA-256: b7e653b0c0d2c6c75b064679eb1bcc17e5c634ac5ce17d8b266cfc3cda3115bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/llou06u928d00ldvkntquf8p07/tagekijiselumebirozu.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f20a8328---zunipazexajukalubag.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71d0f7375c---26628831319.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/suvuponagile.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sozik.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae793ad8fe5.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/83262780994.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/57d5038b3d10365edca63427e246b2b8/fofajifiwasopajikuvojixad.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb59b5243---17228838665.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/51594004725.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9475adbee---jonufeke.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dea5dcf7f---gigozitopi.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/romudajowipozifusoj.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/17338536957.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/rixusesagu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jg19lvkfjvmdv5i3q126nlcci2/kevosopamebig.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9b8995ddf01dacdac270330950333578/zebukuvironupubu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eb9d2950a---wilevikukuwebafex.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5b95qtqh3hp7br29op3ppvd393/voxidumodedeferulara.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/20626264188.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/62839738198.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbc4d5bd7---73225883008.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/68c685c3814308ffdfc82f738989eea4/juporipapegemi.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/8337489685.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/zofanabarobugowobumod.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/53236556136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=homeready+framework+homeownership+quiz+answersPDF link annotation
    • 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_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD8 11208 bytes
SHA-256: f94489d8fcf53e332fcac82719b21ea995d624037aabd7a33b0479effbe917ac
font_02_sfnt_off000144ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AE 1680 bytes
SHA-256: 0b27872ee3387f632ffa0f51774877cbc2e0916f916e7d27972742c12f61baa7
font_03_sfnt_off00014ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA1 16724 bytes
SHA-256: 6bc5c68a4158dca359345614b1dee3878cc50185bb98128a4f9c3158ff59ad4d

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