Malicious PDF — malware analysis report

Static analysis result for SHA-256 4875700ec1d825f8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 08:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f06fde86949111069a95c5366ddc998 SHA-1: 2275033523c0fa85c41687f18b091b93fbda3d1d SHA-256: 4875700ec1d825f8f65241467d7904c6a1fa970f0069c1266823fa36826676f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=binomial+expansion+worksheet+1 PDF link annotation
    • http://ctyrkolky-gamax.cz/data/dokumenty/92321695954.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/48873462044.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210808173417.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/87240546336.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608538ad3daa7---27880022871.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac906b5574c---nozoribuvemukukesaka.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/53018901369.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/sixalutufuduwowofojotu.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/mugud.pdfIn PDF document text
    • http://cl-pub.com/files/files/81316073840.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/acdd2855646f47aebf666fb851cfb8b4/vemuduziwegujupe.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/38213624536.pdfIn PDF document text
    • http://usmleworkout.com/files/file/nunedagipexux.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a83f8956ff4093865f6fc72b57454f3a/popenewolaposatezeg.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/70719746829.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/veprdmercann318l94vsebubfo/patevirugopuj.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/wiropowupojedum.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/73ab7ad4c8dc0ad90d7b8e798cc02474/tutupujuridafunajotixud.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d2195835e2b53f95c7c03f8c485b1151/suzapedutewen.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf29c0b75---pabakesarebukinazerav.pdfIn PDF document text
    • http://fullx.net/files/21538581463.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/22077906157.pdfIn PDF document text
    • http://maksimetall.ru/files/vogubiwonakozafav.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/bf9rk5v7s6fhekon1ettmlvae7/59497768515.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_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 10900 bytes
SHA-256: 8cd339552342069c58624ab504f7d33b56cee6f4170a4446904ef74a70ad978e
font_01_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 20968 bytes
SHA-256: 0e419419a77010a2d0893a70fc43cd525cfd7575e6ddd807ca777591d3e66c9e
font_02_sfnt_off000124f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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