Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb552c05cd41502…

MALICIOUS

PDF

84.7 KB Created: 2021-08-30 17:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94b3521e61e63b71e69a01fe58afc762 SHA-1: fa72e61e1f2c7c4fb79758952a0f809cec8703d4 SHA-256: 8cb552c05cd41502c94f546517bdbbf5c0d4cd9d1944c2c6d6759f27faeee0db
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=british+foreign+policy+pdf PDF link annotation
    • https://motiwalainstitutes.org/userfiles/file/33155295941.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fca701e1c---13804405596.pdfIn PDF document text
    • https://medtek.vn/storage/file/fiwaximedutotobofabageg.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/16424329706.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/niwuferugebapo.pdfIn PDF document text
    • http://tulga.ru/editor/files/71202211207.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210731144539.pdfIn PDF document text
    • http://edeins.com/userfiles/file/16675325297.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/nobodeporizefanamavo.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/64905412173.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b18552b831db6f4ed2db0f7d687541ed/75821236897.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/75478512455.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/61a72b1cb95a7de5a863f3eb7a8a9eff/8608748913.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7bfeaf62---sodutab.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/ziselapadegij.pdfIn PDF document text
    • http://bjjiffy.com/upload/wepimowosimanawukigexum.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/20152212153.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/64955710196.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/69914167831.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/98239536197.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/m94oq8u3trqk30lsqt05oc62lh/11950744503.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/84621248392.pdfIn PDF document text
    • http://yoron.net/up/files/34151616174.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4df6e0c5d---figisuk.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/12820428826.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fe2111a4fee778658e2ba4834caba697/8418435953.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_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 10904 bytes
SHA-256: ba93466ba31ed5c058382b703b5c74cf6c8f3c6e009c63bce90b5185c8bbd9af
font_02_sfnt_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 18356 bytes
SHA-256: 084ebc720a60832e11aa8c9fb8f9ae65ed2c9174a22dc96d04844f7f78b441ad