Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f55d02e3379edd1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 09:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbbba13fefc7b07cf74e8a059c355c00 SHA-1: 4d5e452a6a6c7dea8f88c73825fce3eab2b2bf75 SHA-256: 8f55d02e3379edd1e4e60748f50f17423095046320c60b7d9c5fd72e9d4c2cc2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5e8c3eab8---43845852795.pdf In PDF document text
    • http://cuakeobinhduong.com/upload/files/rogapubirobivuxekizu.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3a58fdf1b00f44dbe61f9d315f4e861f/87035443939.pdfIn PDF document text
    • http://rykatd.com/files/44193934407.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/51576820988.pdfIn PDF document text
    • http://budropol.de/Upload/file/wadudawedevefive.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/vamubiderovugavofes.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/94127528339.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xajojimituwudipa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b53321e7d0f---voxuna.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0dd273a3d1daf934098321f0dd6866b2/10496908042.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/37466114410.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/mofowunelobuwifedonuz.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/gezolutibimowotufosiligu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662d3bcfa2---5075283851.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5o0tvbcbb0bqpnlujgeg2sspo7/modikifejeruwezewokisi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22f4f2375---30027216892.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9cf1bcca---nezajofoluxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ff283a9d---xemevurosuxomudal.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb1688f807---jemujenuzonarojizulomu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/zizupuzawasisof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cosecha+roja+dashiell+hammett+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_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 18364 bytes
SHA-256: 448059f7c5f01002a09e1d8f408be606557b892630514992a52cff535af9f9b6
font_02_sfnt_off00013180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13180 10944 bytes
SHA-256: 8122890784656962cc13805cf5203ef96640b6e586393ccd153750ec960e9799

Open this report in the interactive analyzer, or submit your own file for analysis.