Malicious PDF — malware analysis report

Static analysis result for SHA-256 4017e5ea4e4e3a66…

MALICIOUS

PDF

73.8 KB Created: 2021-08-28 03:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9d5ee6128aa34b57005ec106472b2a83 SHA-1: 12d3de17090145f346e92bef9d0df4ad6085c4a6 SHA-256: 4017e5ea4e4e3a66f22dd3c2d88a155ad4d9dcb3c7fa44be2570aac19c0cb0ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of embedded URLs indicates the primary function is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=supportive+connective+tissue PDF link annotation
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e045ce600---32562096349.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/24877971632.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/9822685019.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/favisemaj.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b062c646b3e---repowimuvanilovuj.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/wovetafa.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/nusedefasuzalaso.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f81e669b20175de4bdf071432f8202e9/76259974775.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/dalaziporujafuzurazed.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/xunajemobobo.pdfIn PDF document text
    • http://stattus.com/assets/file/xodasugiwimivefikuxiz.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608978961af74---zuxemi.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/53725369429.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/lamuzolonudovu.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/28998988488.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/11262338182.pdfIn PDF document text
    • https://swiz.eu/files/editor/18534848399.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/29856993902.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/61200518605.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9185788500---67636925156.pdfIn PDF document text
    • http://jngf.cn/files/file/welexofewokowizi.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/98420931313.pdfIn PDF document text
    • https://amblamy.ee/upload/file/37499832136.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/bejebidomapizajurizu.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/muwedila.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_off0000c164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC164 15668 bytes
SHA-256: 7a03b8067f7746499c6ec92cabf14bc852ceb079428d1024eac040d4f2b8eea8
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 10400 bytes
SHA-256: 25e94a4ac938dd20b7496cde15742b8325ed7556f411103d52713010ff78b840
font_02_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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