Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb536cb975a6d057…

MALICIOUS

PDF

81.9 KB Created: 2021-10-05 06:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a7b6f0943c2455d21bc053f233b4939 SHA-1: 959f333ae96c92ddcfcddc02aaab175200215a94 SHA-256: bb536cb975a6d057c4ed4054ac85d2e27d571150e9ccafc9299c10c35577ef56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the structure and URL analysis suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=now+hurry+up PDF link annotation
    • http://zhuoxinlaw.com/userfiles/file/20210924113313_969860048.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/20780603180.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed04836bc5---64920308184.pdfIn PDF document text
    • http://irinabailey.com/upload/files/71858501021.pdfIn PDF document text
    • http://humanlitech.com/files/files/74668682316.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/todulofuzokopinupetez.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/95668825656.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/20044541390.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/jixuvaj.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/mixogolaburagalelikudas.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/9251216817.pdfIn PDF document text
    • https://best-label.com/upload/files/kutejemikalawo.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/dexefadobegefivesiwam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6f112f814---nitonubupusamakidob.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1857bf9b---53937638129.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20211005031233.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/4721245470.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/vuzurugejolomofopiworan.pdfIn PDF document text
    • https://adikmanis.com/contents/files/15820202984.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/39175738990.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/72850529080.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210925_98F70868E278B589.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e204e146eb---lukasokodesibabugolaradu.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/72959222064.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kekosimewaterukep.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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 20060 bytes
SHA-256: 5ddd4b999305c98c656ad1f4fc2870dd393aba77f440a6b728b74533a1bb5611
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 9824 bytes
SHA-256: fad9bce8bcfd32e3a38fdb18d03eea743b31b6d825f252076c3844f37f841b8e

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