Malicious PDF — malware analysis report

Static analysis result for SHA-256 875c2963846974b0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 02:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ae7e3f51ff82e2556e9a039510366eb SHA-1: cc47c34f97a37f87d18539591cfc6436e6bbd69e SHA-256: 875c2963846974b0f19dea22568bdb1feae9abbb867019afeece5f104b898a8b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda2c35d9a---11176677548.pdf In PDF document text
    • https://himalayanthailand.com/image/upload/File/18319689430.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/36021121652.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210625_152931.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113f548c0306---vepagukotukex.pdfIn PDF document text
    • http://asfalon.com/__files/file/rejoda.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/titulosodud.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/11842901363.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf21c7c6c3---nilova.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/famupixafejumarevijigamik.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/95060647922.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918e07706c8---fixodewinagikuvo.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://cokhibaosang.com/media/ftp/file/wasuselufojiw.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/24499503470.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ed925a94ad7---panagunufibawixosozaxa.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9e1223dd65782ae8a7d6f90561eb02b3/sosivojawokarajazas.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f600c2af6---zejepix.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/34016261696.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bsf3vhfb9om5jbn0aernucvoji/66129401398.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16085622a7684f---20295376625.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/pugidekukem.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/98470995786.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/kewusewupufu.pdfIn PDF document text
    • http://elsped.hu/files/file/50655549839.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/83hmhk541a9bvv0g4so0mkij21/42442842448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=merging+files+into+one+pdfPDF 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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 10504 bytes
SHA-256: 518b9de2c7d5072a159d73b1b1918935d2101f09a9a5e8cb1e00898c92e96a77
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 17620 bytes
SHA-256: 700f37d99d7e99aca581ba724e29c36158faa4aedf0e620e8ae7d578c2b5a99e
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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