Malicious PDF — malware analysis report

Static analysis result for SHA-256 99921ec3a7abc273…

MALICIOUS

PDF

87.5 KB Created: 2021-09-14 01:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc2ccd288b3b16240e4ca7090d374221 SHA-1: 8cd4ae518863b84a1f502382cbd84eeb3150173a SHA-256: 99921ec3a7abc27389e31f49b4c37f4b48fae0f627a5fafedac2baf6938ba97f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit user interaction to lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://didopack.com/files/90026110489.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e562ce4431353440fe6f12c39637b326/46934248457.pdf
    • http://mrhobbscoffee.com/images/uploads/file/masajowogamosimaverorez.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/kabikif.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0ae57370---12041287783.pdf
    • http://orikon.net/Images_upload/files/13490615771.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sma9ouob26dga8broiuufvg30q/redapoxotazotifer.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/85ea0b1060361882f7f2224de1f09d91/rabejez.pdf
    • https://mandarinkinesiska.com/userfiles/file/tuwerovorupujujogevu.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/ganexizam.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6954aefe---57807482974.pdf
    • https://bestrecycledautoparts.net/images_i/file/82902538032.pdf
    • http://hzbmsj.com/images/upload/File/41338445347.pdf
    • http://gccde.com/downloads/blog/geust/files/21418366633.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6e08f0e7b5e0a036c44afdaf769ff189/7453738601.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358d316f0ab---zegizokejunevevur.pdf
    • http://markasib.ru/ckfinder/userfiles/files/80490543158.pdf
    • https://www.terraton.com.my/ckfinder/userfiles/files/18420214569.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210905030341.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6cecc682c---timorilizakuxo.pdf
    • http://noithatmfc.com/media/ftp/file/31735245920.pdf
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/62191923724.pdf
    • http://tikatalog.sk/_files/file/vokorutop.pdf
    • http://bjqyms.com/filespath/files/20210913040930.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/9344237671.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hidden+auto+call+recorder+apk
    • 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_off0000ede3.bin
66937a635f60a4c26a53f05e86889024c02b462cb498e0396bf334f3604f5cda
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 10524 bytes
font_01_sfnt_off000105e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 16792 bytes
font_02_sfnt_off00011df3.bin
736e99862afc5eda71ba627b72400b7116ce6dbc0574ec67eea8845191146b4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 19280 bytes