Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c33c626ea51014…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 20:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e70cc8636b68eedc1aae90c460ad8dfa SHA-1: a740bd5ae214662a2225b17f04105ea855346346 SHA-256: c5c33c626ea51014d80bcf2ce948d3e8fcdc813fa3831bcb5ea70502e6cfc2f4
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/920f4fa50f7dade1b948f292da2dac99/98112335171.pdf In PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/fasowuzaduzusidilemuge.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/4cc7956ae832ab7a533ac5f032e3487e/85883071594.pdfIn PDF document text
    • https://cncunse.com/d/files/94745146282.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612378a7975b2---3860963568.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791d122e80c---vukazujuzirele.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade497736e0---89647042253.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1651acdb6---50047798711.pdfIn PDF document text
    • https://tsegypt.com/file/xaxidawopiteguwokijonobut.pdfIn PDF document text
    • http://greece-ex.com/soxup.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/80177618209.pdfIn PDF document text
    • http://liily.jp/upload/file/20210822024812.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb64d98ad4---tavagisufepimurugemov.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/gekikodadujodapufonu.pdfIn PDF document text
    • https://agatanorek.com/files/file/73132272856.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cnf41k33nd775tls790c52l0jh/54636883121.pdfIn PDF document text
    • http://garderoba.sk/images/_file/88975841423.pdfIn PDF document text
    • http://elm3rad.comfile/xowurigifegozujov.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4868c2fd---66533470671.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/75f7148369a8160319a5d9026184cf12/20798432137.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/49086106982.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/5665959302.pdfIn PDF document text
    • http://mextro.de/upload/files/fipigonuturapimileji.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/mugikewedutijajofovuzerig.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/xanegozefatid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=geburtstagskalender+grundschule+pdfPDF link annotation
    • 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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 20084 bytes
SHA-256: 14b6919cc184bbd0517bb7b378ea32ad081d2cc69d674628dc5daf53ab50f6e7
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 11056 bytes
SHA-256: cc7114d6b92eee285fff9ea61fa7bd3902fdce75fd1560ce0e916cd5f43b9421
font_02_sfnt_off000124a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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