Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f68e0908b7d4566…

MALICIOUS

PDF

74.5 KB Created: 2021-09-10 19:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94ecf6f8eebf7ee94195b8e7fd2ef395 SHA-1: d785ac3c42b6e8bb1a256746d97caff7874acee2 SHA-256: 8f68e0908b7d456617f7bea511e414d9ab8fb85a13d2d29e89c37ea1679da9da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=cool+math+games+little+square+big+tower PDF link annotation
    • http://jarosi.hu/files/file/19970643213.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/lukeranexaxibuxoketigige.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/faduxojotorojilogosaki.pdfIn PDF document text
    • http://techmechengineers.com/uploads/72580550160.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/rorexipinarodovebibewa.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/22579147574.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/dekutiduxetanaf.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/daxipexegalasewujop.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/39323683312.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/noxegem.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/03/meraxi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338342340ca---pofoxobe.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/pepolefirekinuvidufa.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/14730896616.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/79383588397.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/87833642563.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341f08df315---lazexabukubogimi.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/50159323309.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/26685475932.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/jubuje.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/06/file/20210906_030751_151.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0eb7cc3a---vafepivuba.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/67624621876.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee98990e5c---40026272631.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_off0000c088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 16572 bytes
SHA-256: 21f2271dbc66063785ae9842a68fe2a3fbbc6f6909c600b6541175b64806e118
font_02_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10956 bytes
SHA-256: 813d236e5a9ba28b7f3fd3a5ecd86caae31051b34d35329078cff4ed5b2c6c12

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