Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d0d78f8f610501…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 10:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ec4d16fae027ff81496de76ac1b693d SHA-1: 1c7751c089645fcab175d83f27f70412d35938f3 SHA-256: 53d0d78f8f610501d6a53d9f3206bfb6265a0fe3d7d1d04eff711cf2bb866385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm for SEO manipulation or to distribute further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.multigacos.com/admin/uploaded/fck/file/29614210863.pdf In PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tuvakidakojo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/41886636748.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/38386289387.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/makezi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e62ba42cd---xuxesubimaguxife.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/pizeniwawerux.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/jodejawuwi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160782973b9c7a---nizegiwadu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vcim1va3u5re7s8fh8i9698sn9/84696963143.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/636f65f854f171fdd681d991f85fb8d6/gajaxigaromitasujagezili.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/marurisafurowejabufavit.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/shbtkf4568j39pb50vsghslhoi/gorosatowutikomen.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/2116186488.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/pisubuzixagabikelupoxekiw.pdfIn PDF document text
    • http://beiks.info/public/file/fenuliwirase.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/jiwilizejosamulidanomimus.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/tetekowixupa.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/gumedapimugiv.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1986a95c6---liwumibi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/092d1s7bk4t6g60rugqq0emou3/29726372814.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/fixobosigalebukelajuwib.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3377d077cd283037dff5a6acdfd64f6d/4946265929.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e682eab63b0---35924881131.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/49245064605.pdfIn PDF document text
    • http://yuhongzg.com/d/files/46072390549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=thevenin%27s+theorem+statement+and+proofPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 17684 bytes
SHA-256: 5086503d33657ecd299033514e79c0d358f9235bfdc28bd4acb8d35b2d0ccffd
font_01_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 10780 bytes
SHA-256: afa7bd694500d6ef40169b2129c87b1a69ff9510bc697c9ae182dc981fbd589b
font_02_sfnt_off00014240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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