Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dd8ec9aa9b6520…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 02:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42ce74dfda86fb9fd1201eff7f915a92 SHA-1: 5d4f940ab2815460651cbffdea6cec4f833cba5e SHA-256: 38dd8ec9aa9b6520b22a524aedcd55da4b5c24f23d403cda361ec56c317aa2bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and compromised CMS upload links further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.motorradfreunde-toggenburg.ch/up/files/jivuditika.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab839b32e---kusijigajodiwixevajovovi.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/80df704a27d8c81c9056686f4d78cca8/66997689910.pdf
    • https://allmassage.net/upload/file/20210518074202.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/835354eee324b3a9cdf5e1ae17ae1803/mekagoromenunanibumabuj.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jrkgeltu20bn6sqptmmop4heis/venawaregifujizerugozati.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/07a50f739f9d86003439034686788482/87686894430.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/bazexerufakanunawexi.pdf
    • http://www.annaleehuber.com/content_files/file/86805320112.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa12cac55---nupatodiribekotewukuxun.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16075e47fa458e---dozibiwiluvened.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fce97f6fc---bevexem.pdf
    • http://pivotal-technologies.com/userfiles/file/devavojuziginesamenipi.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/41769308507.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/81b57d0646725860b794e1d2b1bde66f/91867803612.pdf
    • https://ferado.vn/userfiles/file/xatasiroxifadasikowebevo.pdf
    • http://nhs1980alumni.com/clients/878257/File/47408562042.pdf
    • http://mousike.it/img_ins/files/kadekedefazedolari.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/96da7072a026d5ba442e3a188026e3e5/fimopezuragisim.pdf
    • http://lineshare.net/upload/files/20210624043644.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/50c1f2347dcca21085f0a888c8c5192d/ziwatoxuretepirumugebiv.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bs07i8k8uhuie26ej6k5b32flc/wukimagetitoturi.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/tibemotip.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175eae8321---vexararulabiwinipav.pdf
    • http://asbufestival.com/uploads/FCK_files/file/bivavoja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+4+size+for+android
    • 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_off0000ebfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16792 bytes
font_01_sfnt_off00010415.bin
88476247b42e683e88869a4dd145571c3bdbc6c64e75c2781b54e40435770d21
pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 10476 bytes
font_02_sfnt_off00011c1d.bin
fac6fb2361de0b7dbf167fda62a763bfc99168f853af0c3515d194a4b89587b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 17196 bytes