Malicious PDF — malware analysis report

Static analysis result for SHA-256 807eb81a8193fd6f…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 02:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17047ff3932b4ed6bc172a3672f7e4c1 SHA-1: 53190162c94ac90a368ad0fb34e59b39e16211e8 SHA-256: 807eb81a8193fd6f4fa7c6249089282fd658c4bf2d5687082fb74a58d6134444
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://polish-house.com/uploades/fckeditorfile/pivir.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/12dd900e61c42fd407b3462f1f71255e/diroroxovopololulamidile.pdf
    • http://i-harmonics.com/upload/files/32420430550.pdf
    • http://montgomery71.com/clients/34132/File/safubogifi.pdf
    • http://peneleos.pl/userfiles/file/tizebijeretezojakomiku.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160be007d5c720---67425828506.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799708b10bd---37588122314.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9e5b3a259---bozigi.pdf
    • http://lesen-und-schenken.de/userfiles/files/joparaxip.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eac59b123---wevow.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d325a151431dc4a64d6223ea1577908e/1808586884.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/143234rtpvkjpj6uv29p7s5qa1/81535868559.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609685a5752fa---12693079031.pdf
    • https://next-engineering.com/userfiles/files/50529657451.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea8d82d0b---80870613246.pdf
    • http://karate-talence.com/newsite/userfiles/files/takarafugezaga.pdf
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/falowol.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/zasafozemomikog.pdf
    • http://dent-pro.cz/pic/file/miwowipenezod.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b1582615---34154213293.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc74535dbe8---22662387235.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/b3insa1t54hhp0jdvhrlf7hvhi/38232970083.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/xilevoja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=calculus+by+james+stewart+6th+edition+pdf
    • 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_off0000ebd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 16792 bytes
font_01_sfnt_off000103e7.bin
1f7a993ee2e53233982e5b9519af59fe86eec0c7075d1208cb600c28fc780916
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 20912 bytes
font_02_sfnt_off00013af2.bin
ad3c5bbaa3d73b21dce91a817b07fcc5cc0a444ad7ce0d7566721add448b7ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF2 11656 bytes