Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b05c753f16d0d6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 19:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9f0e3df6678ba2430885a7bf31f03bc SHA-1: 1d48f6e578d9b2aed52d355a9e6533bf8081545f SHA-256: a6b05c753f16d0d6eecac0aa40fb024ca2b27ba47685645aae1bd099eb7b8a30
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. Heuristics indicate a malformed exploit stream and a link farm pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of numerous URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://kvzriu.org/images/file/rugozanawumajimowofurex.pdf In PDF document text
    • http://rem-stroymont.ru/img/file/borugefabimepusufil.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/wigepo.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/73731257700.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/63814335564.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/34b28fufarm7cjs4p0fbd1rpmt/82397702083.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/sibagepemupibuxuxarip.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/95760373809.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/rubadeperiran.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/45200796994.pdfIn PDF document text
    • https://baglab.pl/galeria/file/47753769643.pdfIn PDF document text
    • https://jagominum.com/contents/files/romijizokarijusubabiwuki.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/66250310981.pdfIn PDF document text
    • https://cityface.cz/res/file/mirukexevotazisoge.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/zujefupipiwidirituponen.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/giniwafufawudabelamuraguf.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a31e7a2917f6b09b1a0a26186d244c6d/30494707003.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82308764367.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/86188989287.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/wididetiturawozegozefu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f18c737aa720938acf2d010c56694489/werapuwojabakikigi.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/lazaxoxisepopezozi.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/dajifekifipodu.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631396039.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/64700946569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aplikace+na+po%C4%8Das%C3%AD+androidPDF 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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10692 bytes
SHA-256: e9e45b499c94897b4cbc65b179a31c57f0f0c4065f7dff9057795df77f5d61eb
font_02_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 18488 bytes
SHA-256: fda54e9200c7c7980c5b01b5dd50daa14f0680e15392811d238eb9e1007b707f

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