Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ace70070bdf87a1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 20:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e7115dc17bb4a5210c35f1254cfefa1 SHA-1: d303d59e180d548459e84a1568882f6a08773085 SHA-256: 2ace70070bdf87a1961cefbe7606f03b3d017db652ea23c5628e99f01fe80eb4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised or disposable hosting sites, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. The embedded URLs likely serve as lures to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chiari-web.com/ckfinder/optimist/files/lefopijotamizetosidisesus.pdf In PDF document text
    • http://cc-loges.com/uploads/file/mejufabarifiwizavob.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/vejefifeludixekolobaxiruf.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/11840896245.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wefedoso.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b17baeb2---kenesoxotalujazipuza.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/73s4elgn07fcf17m5vsm0avmk3/11402289032.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/mowegazesovuvuvupe.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/98250810897.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/95122931352.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/pofijikaronapa.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/bamedajurelajov.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/34713943624.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/3773832040.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/81012299797.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/zorozapafone.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/96829512148.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loxer.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/19532095484.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/79165020188.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/poril.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xuvakumakubejosuda.pdfIn PDF document text
    • http://gyliver.ru/files/files/durutakuzowifineluwezew.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e5fb02e7a705233f85c5be67eb2aa74d/39050787173.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/13098101724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=medio+ambiente+de+la+mercadotecnia+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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 18936 bytes
SHA-256: d9708089906d92ecbf66a92d322664d51921cf31d3ba8aa7ba535fbd434e907d
font_01_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13267 10744 bytes
SHA-256: 466e01fa0c90f789a3c2ca27487b26d62f0955c383d09885f8524fe30c998b84

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