Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d1ef370dd570c1…

MALICIOUS

PDF

93.6 KB Created: 2021-09-13 04:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e0b3c0c0bb1f528b825988160516ae3 SHA-1: 50103c24eeee189d6ef52de47e2c47ac3fe8cfd2 SHA-256: f2d1ef370dd570c199c8cea2de8f89f604fb8f26251f9b548f4a3b671b1ec808
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7f06289c8---tevoridexigirutux.pdf In PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/343664955.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109091007462505.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/mudadapadovot.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/pogode.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/16989925175.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/5653264684.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d75d0668---tovawuneg.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/gunanutawafazusonobekad.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/muzewevavajom.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/82778911902.pdfIn PDF document text
    • http://www.ezmoving.com/file/42538575250.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/dabofumesorop.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/relodize.pdfIn PDF document text
    • http://citra.cl/userfiles/file/vuzuzojekagexudubaseten.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/zeninimaxejonavaxeperega.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/36494282414.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/vikuganezo.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/vevorefitapikarupefozidej.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/nirinarulu.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vaxuboworodowelagikiwovud.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/zogupoz.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mkidcp4am6lc6g70q29i5giqiv/2123081280.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pubaregobiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=earth+live+wallpaper+for+pcPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5e19b2130788301abb021f8617bd6e94/12627783348.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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 16104 bytes
SHA-256: f06cddf61c9925e39e47a8b8d88d5d2c108808d867bf63b528aab798a6fb49b7
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10440 bytes
SHA-256: a28828dfc38cad2c1417e37501fe9715c3c628b0ef0cb3aff87f135713349a13
font_02_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 22536 bytes
SHA-256: a433bd492e5f75c58b895b5a6c2868122b7600b7200479b06ab216822db3335a

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