Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e846fa7ee76bc54…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 21:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: afd50b7cff6bf8ea8bb84eba46c069ea SHA-1: f4a5cd16e648dc12babc55ddfb096747c801d1e7 SHA-256: 6e846fa7ee76bc543288220cfdf6afc09c79b97123be3f5925409c1f0d857bcd
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. These URLs are likely used to redirect users to phishing sites or download further malicious content, consistent with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=6+iron+degree PDF link annotation
    • http://netmutum.com/userfiles/file/zovun.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1fa3473f---zopevifamamub.pdfIn PDF document text
    • http://patroha.hu/file/56044348949.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/movej.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/xosozijubojepokiguru.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/wodoforutuxivalumolekisu.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/98341269713.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/19b345a53712c4173e204efe3ee7d67c/36905139918.pdfIn PDF document text
    • http://www.heksan.com.pl/file/lizisur.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/vixajose.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/16013308932.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pilovugowesuworug.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/zobekixakunumaku.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/31615498604.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/defozeporolonejepologado.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5ba9ad4c4---zusujadiwugufezekes.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/22072723945.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/nefizotunali.pdfPDF link annotation
    • https://cs168.tw/upfiles/editor/files/17910108045.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/pinowobewikivososilepo.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/13181922566131abccdc611.pdfIn PDF document text
    • https://kawanmto.org/contents/files/91210759879.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/91733918083.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_off0000bac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC7 10020 bytes
SHA-256: 603ae42b9363267b517588245090e0b81fb337fb64bd31bfb5a0d10134e86946
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 17164 bytes
SHA-256: 30828176fa9472ee566a738f69c2fe070d95874e5391e5c35ddb58c2479d7731

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