Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8a877cc0e0c371…

MALICIOUS

PDF

69.2 KB Created: 2021-09-20 00:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c0468212b18509e8a89429fbfc98ff4 SHA-1: 4839cf38e780dffeee2f1be09c388ea74f14c82a SHA-256: ae8a877cc0e0c3711839376cb06b206f3cef80adf442b3a99a2683b1ad842154
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicating a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=tangent+half+angle+identity
    • https://aquafilling.com/userfiles/file/sevikuwetefinugazi.pdf
    • https://foodvellythailand.com/upload/files/rupatikamunojiwidukirez.pdf
    • https://triangle-electronics.com/assets/userfiles/file/42743549242.pdf
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/relodokibititanejirivu.pdf
    • http://motopujcovnateplice.cz/userfiles/file/58595261199.pdf
    • https://bravo-hk.com/userfiles/file/72657827552.pdf
    • http://masterref.ru/editorfiles/file/56202238344.pdf
    • https://nidi.mk/ckfinder/userfiles/files/mexigomazasamolizajime.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17626459737.pdf
    • http://rigdrilling.org/userfiles/file/72019872626.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/07666c8cffd9c58ac5ebd87bd23b95e7/86676966609.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5099daa0a---86307471407.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133976ceeee8---96776746509.pdf
    • http://sage-chem.com/image/files/20210908_221614.pdf
    • http://wccflooring.com/userfiles/files/45197460068.pdf
    • http://sl-light.ru/design/img/upload/file/1840502611.pdf
    • http://www.huntsvillepr.com/files/files/nopum.pdf
    • https://kvzriu.org/images/file/funuvonavigodemamaf.pdf
    • http://ain.proximeo.com/ckfinder/userfiles/files/61676573384.pdf
    • http://thepducphat.com/upload/files/bugizulosezinup.pdf
    • http://chongqinghaohong.com/upload/files/kavipinirapovode.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/49398890539.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7f1dae06---13215012613.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/bedugilox.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_off0000b167.bin
7e7acc09db1db4fec45b14a07c78eab4b4b2cd0ff3d3e5f45bfce481965ed0dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB167 15652 bytes
font_01_sfnt_off0000d881.bin
9cbc9d86a34ec70a24faaa232b6ab55feefc479fdb88c17ddccb3663c46b53e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 10324 bytes
font_02_sfnt_off0000ef76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes