Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df77e0ca4e08e2c…

MALICIOUS

PDF

90.0 KB Created: 2021-09-06 09:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e527d999b35fce91709a96ce6ba82661 SHA-1: 2f0953aab059b2b7f07306bdb83ab204330c72a2 SHA-256: 6df77e0ca4e08e2c3b3acce3d87f5b38d409c019638bcd89a9171dc2491637ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=paneer+butter+masala+recipe+in+english+pdf PDF link annotation
    • http://akademia-jedenastka.pl/zdjecia/fck/file/diwofodom.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/26ca2aac0931797966808e8f23a36b11/92317226031.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/be94ba8e24b1b038b44ad513982eb215/koxilapizerif.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/sibisumufajawefu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/22398494187.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wukarupe.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/4044294535.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/zaroxisipujazabasaxu.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/24522544413.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624353196.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9353156b23---3549569213.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/fasibumalogiregasuki.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/rufasoxefelobufutono.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16075022ab7325---67466373775.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4194a76f6---6468357489.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/11797369861.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/19983399341.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca8a27c3b9---49553105223.pdfIn PDF document text
    • http://zeci.nl/im/image/540289320.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/58054930862.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/sevuwikimudosol.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/60606673932.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca64868f4---lamegofifedabube.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/bulufodaxirotuv.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_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 19244 bytes
SHA-256: d486aa6711fadad9c3a363a524b66e23bc380bfeebb6413032c2acf28af5cefc
font_01_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 11188 bytes
SHA-256: 3946c4c09da3380ea0e794a1d42d15f828b8134a140bd754775c0629f9884c42
font_02_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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