Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fd0e35dffbf4bd…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 22:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4ad60f4523f09100fe62177a6a80feb SHA-1: f8f68e32068855bd6a16bf211df643001156084e SHA-256: 40fd0e35dffbf4bded343774568f763c4a1868da574f18f18ae7b4e18f63d341
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of links to compromised CMS uploads suggests an attempt to leverage existing infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://cructi.ru/uplcv?utm_term=watch+online+ki+and+ka+full+movie PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7od8q1r2vpsdh0j4pc5bvckfm0/57637671678.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/3873046248.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/48838731515.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/91384882357.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/gogetewulumigipexowasa.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b12ecead72428db92e2e75fc5c8b65ca/nofagura.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7eb5afd9---zixafetaw.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/pizekiwuzewo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/98734570323.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109131719075257.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/48606705439.pdfIn PDF document text
    • http://charontrade.hu/data/file/kokutojaxiwarutapuwixalif.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/xiwoxesinitiwerid.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365c9b8886---48021470795.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210914084503.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///nokedefeti.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/55194457080.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/wibiwaxip.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/kozabiwonabigudefes.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/balupojunamadow.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/xusevu.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/lemofutiwukifubep.pdfIn PDF document text
    • 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_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 10724 bytes
SHA-256: 0e0b5997364c18963415f619d3a3ad45620e203fb4152f675c397c027d52e880
font_01_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 17424 bytes
SHA-256: 978ef0fce6502cc4bf10d11be4cbfe457d0968ce97c3e0561df06b583ca895f8
font_02_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1