Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6558565cde7850c…

MALICIOUS

PDF

83.1 KB Created: 2021-06-26 20:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fcc45d8b0cd5e971f84149915b06633 SHA-1: 30d8484926d67c55346af97f0996170b3f5878bf SHA-256: f6558565cde7850cf0d3231a72507b2030c6e210d5497f1f10df3627e95c6c97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae48d2e1c5a---20804013100.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3c1bece3---74647759768.pdf
    • https://ladangmimpi.com/contents//files/41997673196.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aee3312254dc95044611569eba72dec3/duxin.pdf
    • http://www.lugashotel.com/data/editorfile/80446043846.pdf
    • http://agendaalzheimer.org/files/galeria/files/vepabedarotekemolidek.pdf
    • http://tubietelbar.hu/uploadfile/27371221245.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc7a3c48b---muguzijolizalokol.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/48861076618.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/72734e7c1be3968e84dd132f30299bc7/55529952516.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090964b0f5bd---rofebujefube.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1fdb2d9721e426b3a52b589d9721f69d/sifotisamowezurubur.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1b01a907---molebu.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b37c32738---pezixitomaketexiwixilav.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebbf8aea2e---xifisije.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef346722ef---kikedatep.pdf
    • https://renesens21.com/ressources/upload/files/bosilanewot.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/p8hm8focsdimnljpuq69ac1mk2/75642640776.pdf
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/30508793095.pdf
    • http://n-production.com/upload/fckeditor/file/90118400970.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/81500339429.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/96647d14985582f28073bb4343480883/17648582889.pdf
    • http://pnmanagementsolutions.in/uploads/fojuwow.pdf
    • https://netwindowvn.com/uploads/userfiles/file/67578403844.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65af18ee7---21809206729.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3eedf716053cc511980b23ba2d5f5e41/wugujaxovopaferalowuwunav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ellis+county+abstract+and+title
    • 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_off0000dfbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 16792 bytes
font_01_sfnt_off0000f7d5.bin
01218f3fd89cb38c8689d1839340f3ad418dde1ba3be38c311cd2dbb59a09cb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 10700 bytes
font_02_sfnt_off0001108d.bin
53075f935ca733ce413b3cb3d6a0efbf118eff3aa264edea589d5ecde390f9fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 17592 bytes