Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb76a232c619457…

MALICIOUS

PDF

80.6 KB Created: 2021-08-16 00:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e50e02addc3cfa4848d4ea81fa6505c SHA-1: 13abcced8e6e8b26b40507585ff5f5e14ff104c5 SHA-256: 7fb76a232c619457b7903cf43703b5de9617708df4e80058202453b0f173cbf2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised hosts and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741fee73dd8---20423470268.pdf In PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wezewab.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/dumovataxu.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/bepuxedobisunugemenogan.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/78138247603.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/85619671737.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/41569714074.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/80547677267.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/3579277153.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/45669592244.pdfIn PDF document text
    • http://mebco.ru/images/file/13268280137.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/61b0655de555f57f3d4e4346e6607231/41316633706.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312fcd5981---66082525663.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/07912e6cb4b5988af021cc1d854822d9/ledadimikujovadifiwag.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/27485375498.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847b787b27---17449154630.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608780b825eca---pusuwos.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/60120943113.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2a08b731780faa8acea8d8679ca3ba50/3729679783.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad2dc76b9---96984286648.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/jesek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hcf+and+lcm+word+problems+worksheets+with+answers+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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 11192 bytes
SHA-256: 59569c50219c31672f0cdf38729fa57d315d66c2df776a852968b107d6c47005
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 16836 bytes
SHA-256: 5f5bcba0237be858c23932ef531c9f912d3fca4f7e72b699c145f80d4b624ef7

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