Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f85efe9d4ad6ef…

MALICIOUS

PDF

82.0 KB Created: 2021-07-07 05:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aa9b7d742f3f98caad6d1cf224ae9ac SHA-1: dad66a52331176d3bdfcb3651d9e1eb03f57d3b4 SHA-256: 82f85efe9d4ad6ef2e4627f046dd3ab237bd4d0f491d0b31f9e6c6b0822f325b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=strawberry+pudding+pie+with+graham+cracker+crust
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3tj9jn7ma6vijhbm26sf630079/pegisilekixoninimedur.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160948e12b91b2---18030542246.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/taeeqog69is5leue8ntc0f9fvi/lewizidesezopijesoxu.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/88539479009.pdf
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/litobagupefaxo.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee85beee7---zejevovakifudi.pdf
    • http://hiace-yoshikawa.com/js/upload/files/25724467945.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd48f4175---21674570564.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/5509312339.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/lanugovujilusog.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abef4c7fa3d---xalul.pdf
    • https://10glazsikeyrosa.ru/file/57726455257.pdf
    • https://aimhc.com/userfiles/file/kusajimaxekimo.pdf
    • https://euro-commerce.bg/files/nibarigizuga.pdf
    • http://sochisushi.nl/survey/userfiles/files/93914812018.pdf
    • http://boekenwinkelindex.nl/images/uploads/15132564238.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zotizanejipefetujawufe.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8b8bd979963401e456a07451fa7271d8/69571768255.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a8130bbb8---nivafurenud.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774802bbd06---nakitinefezil.pdf
    • http://ankurgroups.com/userfiles/file/guvef.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3gosekie3crqhhgu5ksk3c1b9u/99131644820.pdf
    • https://allcreaturesinc.com/files/files/87698202359.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/56607ea36fab818f11e9a8e372d94bfe/35647597860.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_off0000dc04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16792 bytes
font_01_sfnt_off0000f416.bin
0c248297f6fff350807fd56b0da22bc39532f8abf10aaa1950e3a4bdf7222060
pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16884 bytes
font_02_sfnt_off0001201d.bin
25502ada7b1a20460cf6e6f694a173fc4618f4384a4cbb4f544a50110cb0032f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 11400 bytes