Malicious PDF — malware analysis report

Static analysis result for SHA-256 290bd2250400764b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 16:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c79f1378034cb009683a324d8cd8e901 SHA-1: 266bac493d4b4f0aafb53f729ace1edb212dc5ee SHA-256: 290bd2250400764ba1144f585aa92ee7c60ee6a51b745f761a633660f2fb8d84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://volvo-cars.jp/js/upload/files/takikivumodomoli.pdf
    • http://rockbond-aac.com/id-admin/fckImages/file/66549270311.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/penasesanozeseb.pdf
    • https://afma.pt/site/upload/file/88860298983.pdf
    • http://studioesflores.pl/obrazy/file/69360504181.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/73c663c571b6ebcbc2d008ae462537fe/pazik.pdf
    • http://change4best.ru/upload/file/namemukuwiwugukaxa.pdf
    • http://alexdisinfestazioni.com/userfiles/files/95101547663.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101c0315be---vawaredokejir.pdf
    • https://cebubigsellers.com/userfiles/file/dapiguvizesikovatipalemi.pdf
    • http://zamgph.com/uploads/file/031545548581.pdf
    • https://fivetc.vn/uploads/files/8963621477.pdf
    • https://dbmotorbrokers.com/userfiles/file/rujagopifutinojopoteg.pdf
    • http://sydjpg.com/images/upload/file/20210908_210600_194.pdf
    • http://kehlux.lu/userfiles/files/jibojiteb.pdf
    • https://lecormier-menuiserie.com/www/upload/files/jigisirexutigitifuxof.pdf
    • https://marblobaths.ph/app/webroot/img/files/25214672941.pdf
    • https://indiantalentjunction.com/milan/media/79240039901.pdf
    • https://lapakunited.com/contents/files/15880004164.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a17348211---tepunariguja.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/59621375421.pdf
    • https://urologasdainys.lt/userfiles/file/17878791594.pdf
    • http://cavusofis.com/images_upload/files/xiligizovivil.pdf
    • https://rpdev.org/ckfinder/userfiles/files/60809471939.pdf
    • http://futimisdev.com/userfiles/file/90451373409.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chal+mera+putt+2+movie+full
    • 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_off0000cbe5.bin
7d9f69358e00d88ebbd90bce26662195681954ae9e849c49e628ecca94d41de1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 17316 bytes
font_01_sfnt_off0000f8a6.bin
f94066017368864ed86850525346a803fc0f87f040b816915f21f5a18d133351
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 10668 bytes
font_02_sfnt_off00011122.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 16792 bytes