Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f71610b8545071…

MALICIOUS

PDF

82.1 KB Created: 2021-10-18 18:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: db9fcf090d45373013ad6e05464023e7 SHA-1: 232b790846567e82e82ea972ff15119f59562a15 SHA-256: 91f71610b8545071cd13afda194fdc49fa63b50fa32d6c282f779c88299fc2a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable hosting domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is used for phishing or to distribute further malware. The document body is unreadable, but the link farm structure is a common tactic for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mamotato.ro/userfiles/file/89086460456.pdf In PDF document text
    • https://rwd.webseo.tw/upload/files/43344291527.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/vexizuxaz.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/34238607745.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616bf33566773---11361689427.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/39047836852.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/86364339542.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/41269927686.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202110011804374183.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///60068884059.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/tosenegowexirelugam.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/pugogibivajedunukutabotit.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gutifazakad.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4c38983e4---40000231534.pdfIn PDF document text
    • http://nemochem.cn/upload/files/kemivubelalujogituzunere.pdfIn PDF document text
    • http://cartopack.com/Images/file/98396942747.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615874bb0b284---84364790272.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d8c4a7bb8---fatenemefekiwisesawofex.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20211015112937.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/kinijifirobomepejon.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/62539574609.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/rujutulapijipukut.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///pewewijexoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=solemnity+of+the+epiphany+of+the+lordPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 18724 bytes
SHA-256: 0e94f164d8cc937441d8d35cc40012f63452b1c135c96c45de713f71d712a1e7
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10784 bytes
SHA-256: 57ee84d6caad8cc276f77165c6fc4fe750edf4735f22e99f989582ae130e3739

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