Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ebd7cc57192099…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 20:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89dfe2675d798a5ba455f00939550248 SHA-1: daf8a1ce01b289143a66e8cfad0692b821fd6ef6 SHA-256: 28ebd7cc5719209959d2bf9392cfea75288e0ae8ced90255dbf0c38736ca882f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=as400+print+to+pdf PDF link annotation
    • http://123flower.doweb.kr/upload/files/xisujixiledu.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wudalobasu.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/3573206516.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/sokolupizisuwu.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/vozosukixitulib.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc2c5268b---farumakepeditegido.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a20c6ae7---mikasekokapinoluje.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/47222801749.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/boketifulij.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210910_7FBD2E7D01993F1A.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/vofafafunibomuwobuwan.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///3059644304.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/segarikadak.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/zexulim.pdfIn PDF document text
    • https://wsbtitan.com/images/file/semaxixofuzuwetikefadot.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/68003422921.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/74521843128.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210912_6501D456C6AF39DE.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161376743db55b---wopajetopirodizib.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/51789480161.pdfIn PDF document text
    • http://saint-party.com/media/file/60383842727.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/pivumobolarabedovifixuxim.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109140242028059445oygan.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902170234.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/jofukupazufuji.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 18256 bytes
SHA-256: 8b8370d91dc4ffff38161eca16d886e9f089c83e507b416c5df5583f2792f32b
font_01_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 10332 bytes
SHA-256: d2ee5f531e78e08a3024d6c5527ce03ee8590405ea23866d060c2bf76a8efe8e

Open this report in the interactive analyzer, or submit your own file for analysis.