Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf3120fc725796a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 02:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c00ea47d585d26ee862de6c4873c945d SHA-1: 44d928a0abe5173e133864cc45cba85b1fa6959b SHA-256: 3cf3120fc725796a2350f72f0c535856795aa4f58946a2149b36417347f13e0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=android+word+processor+apps PDF link annotation
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/67378268024.pdfIn PDF document text
    • https://nistd.in/userfiles/file/xigufepororozukudogu.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/lomewuzixatebi.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/24240230305.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/13907102636.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/9446413584.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0d00b464b726f704e45f3bb34499fe15/52611771998.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/45148413152.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/jisupuwudivi.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/15436292313.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/18172470680.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/gafulavegiluxuvebew.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9c34217d---64082361581.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914155443.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3q0037vu4dihpnt34k8cgcsloa/tesumefilukozakesipim.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/dazamuw.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/lexevumixodofu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b61fb04ed28549c7de65de72bc2f6d27/50518439315.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/tepujitiv.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141714219f74---79447988328.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zoxofijokeravuruvu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xomawaxu.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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 19080 bytes
SHA-256: 517f053a16d9fe11c10519846d2772365e15b4eaf1681c7861cdaac41951ee60
font_02_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 10432 bytes
SHA-256: f092a5b2c0fdac3e0c3e0f4998accb71388f5cf86ec5eb73a240d4dea4ed4ce7

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