Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f03365776315e4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 00:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7538dfd7347d97e88630c4de1370a21d SHA-1: b23fa6503003f89d08edb91d42044d5a5bb8475e SHA-256: 71f03365776315e4d47d4a48143d9dd47f75d5efe012f7490cc432c2c1aebf7e
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites. This pattern is commonly used to distribute malware or conduct phishing attacks by redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hoachathoanggia.com/userfiles/file/voravazag.pdf In PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210914_8B41DC72AD9B49D7.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/borosoketemezawi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c39f15379---12777234745.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/ratopilos.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2de8525c2d11dc6b85d53993ebc25c4d/tavudopamasepasifuganib.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/53007550988.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/lejikomoso.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/kufogesikepiwe.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/tadebaguv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vpjipp2uf41qoft0dh33u2hlq2/13643632626.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/24583018113.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7prhhlulcn5b1pnpndo3cel78v/vusigiduf.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210914090244.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/96005371854.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/wulerekozufutelaxezij.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/julofixubilogu.pdfIn PDF document text
    • https://duvanco.be/docs/files/18710902916.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109172215136672.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/zimituwiw.pdfIn PDF document text
    • https://tuinvandecruys.be/file/99949103892.pdfIn PDF document text
    • http://aquatherm-graz.at/files/palejuze.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/gugapizato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+converter+mod+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/mafibife.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_off0000c3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 16528 bytes
SHA-256: 7caa2c90a8c845edf44308807bd14a85379a793a9ae218dc4472c3df769c7e70
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 10636 bytes
SHA-256: 27254dc6369cb5e6227e76e28c58ce00ec016027643e0ee751635aa7fd95c721
font_02_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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