Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0e7e95e485bddf…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 20:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a15ae05c678eab4fcb6d2f7642b195b3 SHA-1: eb53d0cd9c386ea15f700889167d0a0582f9250a SHA-256: ac0e7e95e485bddf8067643a49608958a92b2276b160d567c9886590ed0a5dd6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, and contains numerous links to external sites, many hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further malware. No scripts were extracted, but the PDF structure and link farm suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9ba43b18f---tanufurenurotepakosi.pdf
    • https://profesa.net/userFilesfile/puruxogusevidodi.pdf
    • http://dintainoodle.com/uploads/files/witinijolezifuw.pdf
    • http://biometria.pl/photos_fck/file/tepija.pdf
    • http://amsaneeraus.fi/userfiles/files/zerafupogikozixi.pdf
    • http://styrexon.cz/userfiles/file/8876102316.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/895546e672994ab1ea57811c7dced8d7/14229704073.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/83010972550.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16150a4bfb6a00---zevuvijanawapifakit.pdf
    • http://studioghittigargnano.com/userfiles/files/10378312408.pdf
    • http://racecross.com/upload/edito_fckeditor/file/zawomimilefigi.pdf
    • https://sproname.com/files/userfiles/files/28666863199.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a11950040---zevumegijusal.pdf
    • http://abwingsva.com/uploads/files/gezojolimeriretoloxi.pdf
    • https://floridagreatescape.com/media/file/figodinubimenivodifav.pdf
    • https://eownauto.com/uploadpic/files/71473933396.pdf
    • http://kiuanai.com/userfiles/file/30630624118.pdf
    • http://naplesredeals.com/userfiles/files/pinawobejiju.pdf
    • http://araratmebel.ru/img/file/zatasabomix.pdf
    • http://scard.vn/app/webroot/uploads/files/jiveju.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kusnc6d01gqdk8s5qjhf57ni15/jebiwipovuwexibuka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+transfer+contacts+from+one+phone+to+another
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b007.bin
04bdab331176f255261b6298fb212a6fe8a00f08f0637c5ae9255603fad0d94c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 13876 bytes
font_01_sfnt_off0000d295.bin
92f436c773e5eaeba12bab3e459e0bd4469f99c147330ef38259f2e63596a44c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 11036 bytes
font_02_sfnt_off0000ec23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 16792 bytes