Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c2eb68f973b1a0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 20:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 500012bfd9df8ae754c80e5815bfe0ee SHA-1: 4bcb2545a2ed973c49f549a3591fcd02078d3d4b SHA-256: c4c2eb68f973b1a0060fe8ab149ad2bd388b5504afebee75fde3342a1a65cc0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that likely host further malicious content or phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609003ba542b0---29216419462.pdf In PDF document text
    • http://baodieptailor.com/uploads/2021-08-19/images/files/55133172504.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/18613628236.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42685973942.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/4dh835h7deb2telmb529fctmkg/94649093922.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-17/20210617153220511131.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bce8c4f1f---27103948492.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4d6729703a27dfa134c59a596ad07db/43431189546.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/vomef.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff13e47baf---56877459846.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397d733c70---93921469297.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/polorixafezexamasonupil.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/8403492496.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/navekijekuzotifizovis.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cabebce1dce---56010562984.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/me7odb88p9m4413m0jc4q500d3/xowudorewimuzomaxuve.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/dimiwi.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/4d21a9696a217f5e6a85c04e76e444f8/12850351778.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/88472443963.pdfIn PDF document text
    • https://akvaguru.hu/user/file/45010066328.pdfIn PDF document text
    • http://fygl.net/uploads/file/101219078752.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/injghnqc9j85nueaga2r8lrcm7/zodowidugira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rainbow+fish+story+book+pdfPDF 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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 10896 bytes
SHA-256: 74138d46171d340f5a6794991e50d146e2f43039c82ebdaee4253111b9098aee
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 18324 bytes
SHA-256: 4680fdc361c30d8fdf541ba9371fd592cc78ba5812a43b30949edc0610e4cc74
font_02_sfnt_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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