Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb8b855f2f8a320…

MALICIOUS

PDF

100.0 KB Created: 2021-08-26 23:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9f8a1acb800d72c4a569d4ce5d7cb50 SHA-1: 2b92fd4e0e77c0833aca3227a50883d48b5ec644 SHA-256: 5cb8b855f2f8a320a6c2a6bd9b0bab6b49eb250e0389a413296e6a3dc1575b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and a high ML score indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://memoservicesrl.it/file/webuvojewex.pdf In PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/dalovabigoza.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/8094656857.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e558c5523---90501085140.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/91255110792.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/xelazetodasagime.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/6787079454.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161064eab373a3---nexowirepulibazudofuvifo.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/bajikagatatex.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/53543176082.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/sapive.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/43125706076.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/toranatotukisuzazawakuwim.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/60050247018.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/daduxi.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210610_001208_9045.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/56312870842.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/96643b122c01189037a769851dde0e80/fomupuforitoxuzalodidep.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/64171398875.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/widoli.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/siworodepoburu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+world+according+to+waveletsPDF link annotation
    • 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_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 20060 bytes
SHA-256: 989fd4132c207900f6ee50af7d968c51f8652e68e7b08ff798a7773dbe4b2522
font_01_sfnt_off00013c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15421 10764 bytes
SHA-256: 7d75f08052928096bbf8ee0c5ae98fcad084b9fb125b2a819e2e6523818e568d
font_03_sfnt_off00016cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB6 16172 bytes
SHA-256: 4d323bb249e88c398f0095f889563dfd8dc5db968c63eff0834307f32c320b32

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