Malicious PDF — malware analysis report

Static analysis result for SHA-256 572c2e7c0a77a448…

MALICIOUS

PDF

93.6 KB Created: 2021-09-16 21:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 972f0e846a7532fd6cfd955f6f63ad91 SHA-1: 5a91e3f9205e8fcb713e000cee047cde69bc6d86 SHA-256: 572c2e7c0a77a448888c9077be1d822add8e9e9a0a6ffdf4e6af10ad2234724f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, directing users to other potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h5lhnghr220fhbmf510cm72nj5/kipafiv.pdf In PDF document text
    • https://annekienlen.fr/imagesfile/rozakulotofi.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/witomikeza.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/59928177766.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/1220342588.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142035276c89---48823690911.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7abbdf35---bopenazub.pdfIn PDF document text
    • http://tulga.ru/editor/files/75025940126.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/zifogixunavu.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/zadovirejaxaz.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/zegobobonakevomipofubonuf.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/denoxok.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/divotorobatezasumud.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ae42186e---wisegegokivagaxav.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/13373312315.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77707545979.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/35792266615.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210910205054.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/21648027263.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/peramudajimetibitijimeg.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/zelomofire.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/tipotapavereluwa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/36ff323a34ceb1f1fea84903b4355020/raleworoxetopap.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/19955658284.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/39050464247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=column+3+periodic+tablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 17836 bytes
SHA-256: a3e18780efb60b8743cafc18ab9597c2b6a840352fa4ee675f4cfa665b3ab636
font_01_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 17164 bytes
SHA-256: 7a8721038edb2d39b7e2d9c775e2d52724a1f0bef955c1362bcf3942b9765d25
font_02_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 10952 bytes
SHA-256: 042017d84751c42874ecefdbd6d8e14ef292f6c386c6ff7e221120f9028e0694
font_03_sfnt_off00015049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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