Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dda55021d775e2c…

MALICIOUS

PDF

137.1 KB Created: 2021-07-03 06:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fedb95422e81f028513f2d3dd82f13c SHA-1: ce3668bf12e4644eec84d97a95387276e7196e27 SHA-256: 3dda55021d775e2c059a448f7aa88c4656c07212a1ff4f6884279a2602252939
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially untrusted domains suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=people+born+in
    • https://zapcdn.space/web/img/podborky/files/wizipolubositu.pdf
    • http://mppscstudy.com/admin/usercontent/file/guropagamasesejezife.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/86796789788.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa24e8b179---puledulisakalilanurupas.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/65aa26e154035e51ee9db297e3b68e54/vudotadifubo.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d867de177b---pexasoxa.pdf
    • http://cayxaotamphan.net/userfiles/image/file/13071569940.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e793d5de88---pezabuduzosevizudufub.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f8dfb86fd---befagujem.pdf
    • https://ludifrance.fr/userfiles/file/49685581617.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ad7baacb---vepelinetojepujexe.pdf
    • http://pileshoppen.dk/userfiles/file/nufavojevawadikuviliki.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d04988a36c0---rimojukimixamorobaz.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/249bcc6796613bde153af4a014af0603/tuxokuliwuxi.pdf
    • http://gayaarchi.com/userfiles/file/20210527191747.pdf
    • http://nfc.soo.jp/file/jikulovadanevorexoxaxuvol.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7ea9760b872e7c03f75374d68af9c8a9/27978138743.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b53d609076940e962572233c672b312c/3194939417.pdf
    • https://hpsoft.shop/upload/files/41331123692.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/468054237.pdf
    • https://aiaciran.org/cache/fck_files/file/75247269051.pdf
    • https://aokman-drive.com/d/files/97474106263.pdf
    • http://tantos.jp/js/upload/files/garawegoxul.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608766cd74216---51330596979.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_off0001ba27.bin
e102496f65f834c1b089ad1e085f35c3657c2d3fc43556848bf01d6bf6485450
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA27 18672 bytes
font_01_sfnt_off0001e940.bin
91fe24d9be85ef94c9f253d004e005ca3b5c9d35cc5980f330e551b053304653
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E940 9956 bytes
font_02_sfnt_off0001ff08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF08 16792 bytes