Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20fb523155bd73a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-09 01:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 614aef383568d322bb44dd4df2ef271e SHA-1: 058a4d39e73dec39978a645a1f3b3ba9c9463a5f SHA-256: a20fb523155bd73a8c8f5f3c68cb43968c6eef77be73decf952bf23ec9bc75f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://phuongsen.com/img-chamthi/files/39176068535.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/3098673453.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ecaf13217---67313067185.pdf
    • http://crosswaysrecruitment.com/userfiles/file/12379835051.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e71e7b692---jupabijureb.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8k3j126opk4pld194fmq4ao4un/29870340660.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f16049f787d6d2275f676e24a79b21cb/vajebutufoxi.pdf
    • https://sgicorp.com/userfiles/files/77941771857.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613003a2d50e2---nifuxij.pdf
    • https://arrayamed.com/userfiles/file/zolewu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0fd17f5195acb9877ab773a6012b946/rozefitaxuvar.pdf
    • https://heyratacademy.ir/file/rolozidi.pdf
    • http://membranekeyboard.pl/_data/file/13213759792.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec845ccc96---mibiluguwejodiwuvo.pdf
    • http://greenhere.cn/upload/ckimg/files/202109081638436527.pdf
    • http://shamayachts.com/upload/file/rarixufavikaxoliw.pdf
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/rijigupolixozaw.pdf
    • https://atcotourismtravel.com/userfiles/file/firatad.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/28of3fmsehl6jt0k6big97fhjl/mawefuzowifilat.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sofabolojenesokuweji.pdf
    • http://www.tivafa.hu/upload/file/22915167441.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/lemapebupepogiwon.pdf
    • https://imaggu.com/ci/userfiles/files/51262693253.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/96696316440.pdf
    • http://bidmitt.com/img/files/file/43491488297.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=yeh+jawaani+hai+deewani+watch+online+with+english+subtitles
    • 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_off0000e294.bin
002e0832599acf788f3ba8f9f844a958653582487ec597fda01c853148294102
pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10988 bytes
font_01_sfnt_off0000fbce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 16792 bytes
font_02_sfnt_off000113e0.bin
2b844d876ffd515c369a3eeecf28e8938dc78e167b2f3f798c983db9ade2256d
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 21196 bytes