Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ab8f74a430a587…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 13:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ccff171a25663cf9ae0be89e47819da8 SHA-1: 7298de313edc8c66d32eba22dba37b42cb670952 SHA-256: 63ab8f74a430a587793769d5d40dca6d60717a3f4a86bde4e5065542a551641e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=2xl+supercross+hd+mod+apk PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/823fa054973945a299db23ff487f2271/25133746618.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/fupugizukuronapubowufek.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kaxezarafexanerer.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/95225829257.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/60903636602.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/vajewojikiduforopogupop.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/26467014188.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/datorokenujebi.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/jomelibajefaroxorupu.pdfIn PDF document text
    • http://canadanur.com/resimler/files/luzapawizejezimametebus.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/16400397142.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/prpfkil1htskusosb6gtsqjqba/lakufatogumamabeji.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/niwizafarilatobe.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/tipuxowudodowerimepu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fe2ebf9---20931179844.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/5167798116.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20acc5a72---dosanasuwuvanuzipoxuvu.pdfIn PDF document text
    • https://aildf.in/userfiles/file/22909832379.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/83194577468.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/74518044240.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/kopejunatakax.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109011043139582.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/32279329020.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/zijukabederowajesasugizi.pdfIn PDF document text
    • http://hidropro.hu/upload/zigaxabize.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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 10800 bytes
SHA-256: 137620c82191cac69869ad00301038783b85d432ad494872edd8b4c83168858f
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 19032 bytes
SHA-256: 1a4a87989c4be14472186f042decafecaeaad2e9aa33e92cf246282f70e61708

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