Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e19e050cfd4b147…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 17:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2591834aa09e5cab82281f75925da29 SHA-1: b06380ac4f7a9005cefcee7df451497089627d5b SHA-256: 3e19e050cfd4b147fb6f74e4fc41270b1507fb959c3171b8abba8645d8b1f89a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external websites, many hosted on compromised CMS uploads, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d9c66fa1---pibusebagupusep.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/72952286136.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52d9c47e4---71684575268.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a214d6d1---18711718585.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096551909f22---1779666347.pdf
    • http://dogoxuavanay.vn/uploads/files/juwajise.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160764a0f4882c---javasorijarumasaxefixejow.pdf
    • http://arniestribu.com/campannas/file/79157893889.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ngs4tuso043t6q094nacf7bsp2/pewijize.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/17955565140.pdf
    • http://tantos.jp/js/upload/files/dinakerewinesalope.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/867c9d0cdf933668b8d6a5f1c98141e5/buvovozaweloxudo.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/57267f0bb12056b5949f5111b9612550/futusevatasepalufiwopiw.pdf
    • http://garage-fuji.jp/js/upload/files/zoxitote.pdf
    • http://anshan56.cn/userfiles/file/16260995471839942587.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/99843423881.pdf
    • http://tsmsaldature.it/userfiles/files/zonamasiturapoduta.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d86e41177---nolisuxegebulunu.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160865fd4b888a---refumenud.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaef5e84a7---zulusunefukadujalujofuf.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/58820312845.pdf
    • http://hugslock.com/app/webroot/img/files/652389421.pdf
    • https://samarpanbharat.org/trila/userfiles/file/32074330896.pdf
    • http://streathamtaxi.com/survey/userfiles/files/razetusa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=introduction+to+electrical+circuit+analysis+ozgur+ergul
    • 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_off0000d5db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 16792 bytes
font_01_sfnt_off0000eded.bin
03d87fdc33427d63a527bd41fb23a9aa55f458ce7ffe10872b48f94a64401373
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 17728 bytes
font_02_sfnt_off00011be1.bin
769b4436d46c8c3755d5b56931adaffde0e8423b48f07e699e61f13dc9793f81
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 10772 bytes