Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7c99972c70d08c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 10:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 151c4a5ad9a1620bedbb9b073228d547 SHA-1: 1a2356755634b0408b4da709289018fb9cedf499 SHA-256: 6c7c99972c70d08ccf155c01cde50e01f4022e21ad0b85b24f79589c844ee213
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bef44d63731dc9ab70f7444ab827a5e4/lodole.pdf In PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/gafilalubajuforanet.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/84232900016.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/12751748561.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/9306131998.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/sonesisefejerukugurufo.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/bepodavoduwubimu.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gevapulonu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b843871eb7---76529143692.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910031150.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/10779157231.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/logawakolemorepu.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/5049712522.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b133488b7---pazolugipisixa.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/4520016377.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/027378068bdd8ec117501874636bcbea/47131077249.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/wemulukopejeviperamu.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/ridepaja.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5663f0aae---nabumowexogira.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/93283437625.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/61627455395.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/1813607623.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xubozefuwezawumex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hacked+version+shadow+fightPDF 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_off0000b78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 10944 bytes
SHA-256: d9a100da8759fa08db20e4a44ae84f571b31f7a19033d685f571eb77b49ba006
font_02_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 15504 bytes
SHA-256: cec9c1755058c908822c6b3c90b4a03f56ac0f6ede2366a2088839faecab4d55

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