Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38c0a839faeff88…

MALICIOUS

PDF

116.8 KB Created: 2021-09-20 19:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf72704b701c66d4e279dae43e99541d SHA-1: cfedbb82cb50f21471ece6d9f6905a3f69e56964 SHA-256: d38c0a839faeff8849eacdde4ad378c3a6a3b233ff62db45d36b21bfd975ae12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=123+bollywood+movies+2020
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zunobor.pdf
    • http://congtyvima.com/images/Download/sogatavepozomox.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e938ab411---jonuxumeratubekasowisiko.pdf
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/dututazexagaso.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccd9ac0f2---16396937590.pdf
    • http://thegioioto.store/upload/files/98009558889.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/42192141427.pdf
    • https://giriconsultancy.com/content_files/files/53062344868.pdf
    • http://mini-garden.ru/userfiles/file/10849257199.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c209b4d1---55630763320.pdf
    • http://lamexmarket.com/uploads/files/kaxepuwasipozanidobam.pdf
    • http://recviem.ru/img/upload/40132781518.pdf
    • https://hijaustabilo.com/contents/files/3876647614.pdf
    • https://simbhaolipower.com/images/file/jowinopa.pdf
    • http://www.rannatennis.ee/data/upfiles/files/94292725005.pdf
    • https://loyd.rs/images/file/kozeroninik.pdf
    • https://hrmconsulting.biz/upload/files/61441971280.pdf
    • http://nwatchonline.org/userfiles/file/9721744687.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/28284661633.pdf
    • http://aromata.ru/upload/files/wowedepovagetilugos.pdf
    • http://hennel.hu/sources/elemek/file/fisejobotopurizaxexen.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/sonaturiwokakaduzujozen.pdf
    • http://burattinojatek.hu/userfiles/file/45894167126.pdf
    • http://neza.cz/UserFiles/File/68591356866.pdf
    • https://alstar.uz/images/shared/file/somawa.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_off0001639d.bin
3d55148ead858eba4564b207a9f12420d6da04d7e8a1ebb414d26a24f1429b73
pdf-font-stream PDF embedded font (sfnt) at offset 0x1639D 10720 bytes
font_01_sfnt_off00017c53.bin
0a2723c494b50eeb2ca6d902f25395b3278b1daf1d7c1129ee5e2d9fd33fdcc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C53 18724 bytes
font_02_sfnt_off0001ad31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD31 16792 bytes