Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68192453156560c…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 22:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3da8da2b761bf60ec2564630d0a64546 SHA-1: 5ff8a6c50e633d80f9d41dbbb463e2cb57f932d5 SHA-256: a68192453156560c84b881de9a88faf6d6401c2cfba0a86e558138aacdc5b393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://anmoul.com/userfiles/file/87384237220.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d505df13a18---rijivexafowefijig.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/95801366481.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9be869be16b721c3273bede13fc4b09/ziwuramomanuzazosejusi.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160889534ae0da---latirasopigisuliwateg.pdf
    • https://thaiwoodengames.com/files/upload/files/karusenaretovozido.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p9o90lset5dcqltpm6grl2dne2/83954865024.pdf
    • https://defaico.com/d/files/40250617132.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5d113ae5---jepukimogo.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/d3o8s8rq0shdi0jnr6rhf17et2/viwokunoromeb.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/i6e5pkapqq60p26lmsli2mk745/ziwex.pdf
    • http://slsnn.ru/content/file/24379367945.pdf
    • http://andrelandberg.com/userfiles/file/80879218685.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0ussh04e1fpcq63auvoj2vt536/xenexotujuvavuve.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/592201c0bf3d3a396e69a733da131b16/27715430406.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e9a6d8f7a55f883c4276cc73ebe8bb28/tibegu.pdf
    • http://a-kamen.com/userfiles/file/zobajanepafopebuvexodobom.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087af825f61d---wifakikuwa.pdf
    • http://aygroupmuh.com/image/files/fezijob.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/59093578170.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbb827682---ziritujenu.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4f44c8ce4faf8ca3746b2cadcf399225/90824462946.pdf
    • https://betentour.com/sites/default/files/file/povogoke.pdf
    • https://purefeeling8.com/data/file/towesuxiripe.pdf
    • http://huile-de-nigelle.info/userfiles/file/84282647168.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nephrology+books+free+download
    • 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_off0000eec8.bin
e665f8f3c12d04bf25aca414ca5b5bda73a64107b83760ea635bc466ff233ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 17100 bytes
font_01_sfnt_off00011b08.bin
23d1caa0e72699b2481f6d4334b711b91dc733264ae39ab4a6df6142960f8554
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 10996 bytes
font_02_sfnt_off00013431.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 16792 bytes