Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffde24fada26893c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 13:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d6d695d0af4048efa0bcc0a3ebc4f1f SHA-1: 53bc4d99f55b13b0fc3bb5ad345953ecae7ff5fa SHA-256: ffde24fada26893cbf708d373a0f471339f890340cf84a4929ed8ea2a23d72e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

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://smidgel.ru/uplcv?utm_term=fake+gps+android+10 PDF link annotation
    • https://sushixusa.com/userfiles/files/67366002828.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/7056373428.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/j97scro32e44ugvlr97rm1k4im/40556072154.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/55471339858.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16304719771352363654.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/99322325958.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/lopakevipijik.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/32398002985.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf401d084---digalop.pdfIn PDF document text
    • http://imaginove.eu/data/Files/26059130434.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/92496502094.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/62842420618.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/wogiweferuzuridumeboxaxu.pdfIn PDF document text
    • https://fasleh.net/Files/files/92651373277.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/87757858571.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109221818383190.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/7695915629.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/satovofamedemipivotaw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/buwilagovas.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/tugexovebagatuvedo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/30608490393.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kugikitoxawisat.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1263c3da1---79640857483.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/raxelam.pdfIn PDF document text
    • 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_off0000b047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB047 17056 bytes
SHA-256: 131f5503400769b54fd8dfdfaeebebb99162b8ce90759a05e9b14b5b45548884
font_01_sfnt_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 10668 bytes
SHA-256: 0f7b5b04d81101a1de1588272b6b83937e9488f54727d011122d17c1c5ab18ef