Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0346ab6399e7cf…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 13:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc38f797f12863a13fe25309267dfc7c SHA-1: 4ca034e2201001b55bb3a76a5f43fe5e9aa70a5d SHA-256: 9d0346ab6399e7cffe85ba93964b8cecaaf8082c664a089e982755713a682f46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, pointing to multiple distinct hosts, some of which appear to be compromised WordPress installations. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/396da8c094f2a59ae7327e9aafc7d111/43025633903.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501232207983786.pdf
    • http://paillasse.hu/userfiles/file/pesolulozutigivupil.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a107df4bc82---wuwowimumemoxituvatu.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/f4d981ce9aa0c3079039fceae82eefb4/41764886333.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/138530359b45e5299bbe27a9765014dd/zawolakepanowivutapisur.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4555a69674c70fc6f47cd450bc241b20/loxulefijas.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a975b12b---83779015531.pdf
    • https://arerp.kr/data/file///luvugexulavox.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92922147399.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cfdec8c27---35347565378.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/dinufap.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f0e1c2ab151e6516c25f85a3f780b85b/mafemobobepudozulawa.pdf
    • http://hanifeugur.com/image/files/libobamogogesel.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/83122526944.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f440217e1d---27665337346.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4707d172c---xuzarujemepemomewide.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9108da6a---42957983046.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/27088289124.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/hgg6loeec4oe6bdmfpnnndepdo/pojidusanomowezixesa.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82fbd324b---witegopigoputosexe.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8377a111e---gifanobevubulitegom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+multiple+pictures+into+one+pdf+iphone
    • 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_off0000f59e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 16792 bytes
font_01_sfnt_off00010db5.bin
8cca26a439db54b20e03ce049ecd7c28b7016cc6d28f5a039c2edca93329748b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 11152 bytes
font_02_sfnt_off00012789.bin
f6549377b49dbca0a6852b2325539dcfa2e0b4c9e4800a02eda3997119e05848
pdf-font-stream PDF embedded font (sfnt) at offset 0x12789 16964 bytes