Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2a3084b3a87e3e…

MALICIOUS

PDF

95.6 KB Created: 2021-10-07 13:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 242b081440e811df5dcc26a84ebee869 SHA-1: 02d51ae94691d60d2218a11d3ccbea4e1480f667 SHA-256: 4d2a3084b3a87e3eef57215f63859ba0ff874bf1ff6aca434e6297c0cba7b2ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, indicating an attempt to execute malicious code. It also functions as a link farm, directing users to multiple unknown and potentially compromised websites, which is a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kerogonigesadiradat.pdf In PDF document text
    • http://mishelik.ru/userfiles/file/76559866763.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/16056212755.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/jonatetajabaxofoverezilod.pdfIn PDF document text
    • https://simorgh.it/uploads/file/duwasuzi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161408f05c4f23---kusojajeripojizugo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/86lc8kjl84l5m5k0k4enlh32ov/36745771963.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/lavegejasenebilepalufu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16153eefc1ef6a---duxokuwivijujuxojij.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/08/suveziviweboz.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tofalolinuvofu.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/19042672633.pdfIn PDF document text
    • http://1carl.com/userfiles/file/vusamejo.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/64558287211.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/9458932607.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/10201496187.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/65510307573.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/91266991973.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/5122904330.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021926_15858_772.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d46fb5d00---vuzikisuzatewa.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/42600606497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=leasehold+for+salePDF link annotation
    • 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_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 10116 bytes
SHA-256: adf2a3770aca25b71275268aae1f4bdace6da887ad3dc5369a0c626c215bc29a
font_02_sfnt_off00013d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D70 19472 bytes
SHA-256: b1b351b18917eb7f2b8e7da8500489b966bf9ada17dc17e1d96ecd34f5318dc6

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