Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d57987fbdf7cb0…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 06:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c032755c44086f82134f4be2f7847aa0 SHA-1: a272851f2c7d920129c64088ea7b9b8f8f650423 SHA-256: b5d57987fbdf7cb036336a07a2f22e251569c027fba8d2aa2bb2993803fa96ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://akgikorea.com/file_upload/fck_upfile/file/julopizunuwa.pdf
    • https://eternalbliss.net/file/baxoretuvotemuwamikijuwen.pdf
    • http://pulsarvn.com/media/ftp/file/53607233142.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b342c473172---86848468836.pdf
    • http://amirafouad.com/uploaded_files/file/95871285505.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c521ad56fbc---51934017540.pdf
    • http://naturalmis.com/userfiles/file/82096764874.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3pcaeof7uk2r6o5qdj6936e5m1/xulewulovupaki.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637d6d06b3---71495181315.pdf
    • http://avision-italia.com/userfiles/files/perurirorekekamuxo.pdf
    • http://bigsvatcharasith.com/userfiles/file/pekijoposos.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a08fb90ad70---33216993074.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/94010cdfc87cf055fc7c02ebd8a50f2d/23059835788.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/181cd7d99829b5d02919532cc097482e/tuwijukivojiwexumej.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3e824675---sitomudepekoz.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a367fcaab1b---43497828553.pdf
    • http://veterinariomauracotti.it/userfiles/files/goledaxetok.pdf
    • http://www.iece.in/userfiles/file/petifid.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce86d1fa0---75039584002.pdf
    • http://asfalon.com/__files/file/89689927902.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7bdd44af9---69341225015.pdf
    • https://acgroupenterprise.com/userfiles/file/gibisidesomig.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/24jerk98ol4uu5fp83mledqpv0/84878313995.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/jjm4aj14m6p4skm9k0qph6bknm/vokumunawomor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=simple+songs+to+learn+on+piano
    • 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_off0000cf4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 16792 bytes
font_01_sfnt_off0000e75d.bin
0e7368979dba506a4cdf26a3fd7acbf4b4e72d68875b3463ebe471a344fd40dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 16240 bytes
font_02_sfnt_off00011190.bin
2439c10d954acfd284cae5c5c7e671c1b6446b184e377743c6acf66d3bbf3343
pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 10668 bytes