Malicious PDF — malware analysis report

Static analysis result for SHA-256 c265e004a9826851…

MALICIOUS

PDF

76.4 KB Created: 2021-09-22 15:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8005640ea15fd8bc43bddc3ecaf092bd SHA-1: 95c511a0e31bfbf1e94728805ddbfa53e9552840 SHA-256: c265e004a98268511f70535c3437d67266f844b90c6d2954d4f6de5f5e3c0558
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or to download further payloads. No scripts were extracted, but the presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://telechips.com/ckfinder/userfiles/files/kexarusamim.pdf In PDF document text
    • http://kindergartenhelden.at/upload/file/82800022222.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2f8de1fb0ef1e2bee2d70a58df95706c/nibova.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/jonokesisoriwo.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/19631681765.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/2240501.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f007d464f4ff0b6e206ff30939b44f2b/87266795058.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/moxokalabepejawanusidi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/widonaxi.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/5836693810.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146ffca5b836---jibozulefulix.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f420a3e2---vifilewenunugiwonasegi.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/kunafoj.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/83790786218.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lo4tc8ld05ecsm4f61ichpnbc4/88403358926.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/kavugugiliwixojil.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/89811126346.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/54652993397.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16948069301.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/94749605287.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/50145043067.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/zigozija.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb333a1f84---51371675126.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/60311573082.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/43761116293.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/doribisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=serial+autocad+2017PDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/korof.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_off0000c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 10608 bytes
SHA-256: f12737b60773acfd7df1ae96992e9af443b3bf6e98e1ca5d9ab46dd8cfa916b5
font_02_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 18300 bytes
SHA-256: cb236557d60bec706afebd82daa0d6399e8c96f26c7bc3be80acec064ca8b4f0

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