Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9cd2812603f5a1…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 05:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ecb1f8b429a284ef87bb77e85cb8287 SHA-1: f52bdc63e23a363a9c90372b0f13c675ff4e9838 SHA-256: da9cd2812603f5a1eb79ba2b0263d01236266b013996d0949de038e4dd2fedd1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://haniltm.kr/upfiles/editor/files/64771410756.pdf
    • https://chief-moving.com/editor_upload/file/dorurizofofodudorimofeb.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/k9571abe7uhfmldkhiffvr1ui0/niwodorekejinejife.pdf
    • https://jetaime-shop.com/files/64058308439.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c818888878---dadajifevewodule.pdf
    • https://tangentemag.com/img/file/kimadegetebozuserimon.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/320c2d09a4ccbf1296d4697260b0f3f2/xaken.pdf
    • https://avela.md/userfiles/file/juxubiguweritefatamisufe.pdf
    • http://wildpflanzen-planung.de/file/90639266900.pdf
    • http://mabifitness.it/userfiles/files/5869688222.pdf
    • http://tcsm62.org/uploads/news/file/kafujepadomumexekoguj.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/caou1407i0hgip7espfr2jgis7/7379558404.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26223644b---narimebovoxujagudulebili.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/547e19a574e865068c4944962c3f9f42/suvowuwejumazogol.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a96cd617f0038f320e16e40dfddcd2d9/tudexujetorobejosituwager.pdf
    • https://euroroma-bg.org/files/file/zurososozobadazobujeg.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083f737f1674---87604833305.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098703871242---20632417794.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bcf09a2370a5603b35cb0dea637e9fcd/lanipal.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608549d84f49d---jujug.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16feda2c7---ralegezadikebiba.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b70433b3a---vujapulipasejovofek.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea91cd358---26554376750.pdf
    • https://pet-fashion.ro/mm/file/bapuvusiruteziso.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a114667cab---likukumesebi.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b4072f0d---luvurexudebororudagim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+suture+a+wound+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 16792 bytes
font_01_sfnt_off00010dc6.bin
b5a722b688048f22602d240a8d88b3cf1113bea7edcc4deada17ebb10bfc4e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16356 bytes
font_02_sfnt_off00013851.bin
09b745840d15a8e2d305f4972cb5734c7017cc3f66aa680982a00b2c1c22c9a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 10528 bytes

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