Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd43b9f8ff36c58…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 03:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58d29fb5a981adf5066a63b3c4786566 SHA-1: 0114d8700e8f8f038d0bdd00aa2fe7e12d1870df SHA-256: 4fd43b9f8ff36c58f17300177e8b675c96860604935814a42b20f5025cfd6ca1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614112b0e7733---nasunosovurureritati.pdf In PDF document text
    • http://3mfa.com/images/editor/files/zifusitenizeriwadurubejos.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109071850278123.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/57190147891.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4259155e---mujivikijogoriru.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/silol.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210914_45D6B07342D390FB.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1440a633ccce306bc73b1e200e17c9c9/rofimijorarifawipedebu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a8337373---vitokexalujiberamazajux.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/7173874268.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/basakamurotavumu.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/tositetaz.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/mekegizemariwimofapev.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/pabubojivolegaj.pdfIn PDF document text
    • https://777mto.com/contents/files/piroluxividotiloririniv.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/zupuxizogirofiwefatewus.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1520e761a85ceaffc48be6eb4c246918/6058437.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/puzuvutigagon.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/63279785781.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/98675855465.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/30d65b8d04a7aed95f557182bb3dd2c4/32676459259.pdfIn PDF document text
    • http://parfumland.sk/upl/16186238255.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/78540287438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+let%27s+go+pikachu+download+ndsPDF link annotation
    • 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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 17508 bytes
SHA-256: a53dd9835d0c7b9cae3de0c4be0bd48a80bdd43200c6dd7ab08aa1a224519dd4
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 11172 bytes
SHA-256: 568d62792818d7030e6af1ea56d96dbbf0159e530e95c24fd0ecf57a2ac8c7ae
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1