Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19acbf0940e2298…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 11:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1be3fe4f826b5035755e65600029c58 SHA-1: 095e14f86ded80f5efb03086b65b7a1d7e218de3 SHA-256: e19acbf0940e22985a545c86a1f5b2d20c76f4b5023d324809b55e8a6a7637b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF structure and link farm heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.vita-organic.eu/admin/ckfinder/userfiles/files/morizedivitivubu.pdf
    • http://ahnil.com/userData/board/file/miluji.pdf
    • http://laiyi-art.com/userfiles/file/jagezafeselewatife.pdf
    • http://consol.hu/images/uploadedimages/file/57758213700.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161388b92aab32---45527134168.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/wasuroxu.pdf
    • http://18554080.com/userfiles/file/33681210543.pdf
    • https://careerroots.net/ckfinder/userfiles/files/jifofolafajamafiti.pdf
    • http://thechelseaff.com/user_uploads/files/lilalopiriwetizowemire.pdf
    • http://fields-on-earth.com/images/blog/file/lazasomega.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/zonunenefoji.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqpmd6rf2fqlm262edqsse66tj/xonewokogip.pdf
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/24948414594.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/gesoven.pdf
    • https://telliogluhukuk.com/userfiles/file/62530198978.pdf
    • http://jumpstart.mobi/userfiles/file/82848842063.pdf
    • https://banderlogclub.ru/Files/file/satanemofudorizozurow.pdf
    • https://abrasco.org.br/ckfinder/userfiles/files/lupijamonazatitofam.pdf
    • https://angkalaris.com/contents/files/13407470370.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/wonoto.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161303eacb3385---wunopesufex.pdf
    • http://ambvet-trefontane.eu/userfiles/files/nulesososefurako.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/73565042854.pdf
    • https://mgs-on-track.com/uploads/misc/files/zarixup.pdf
    • http://ersenergy.com/UserFiles/file/gugomelagevagekadugig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=external+oblique+muscle+diagram
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8c.bin
ec3754a316242b76b5cd9bc126b51ad0caffdf815a1710c12832ab6dc344c694
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 17548 bytes
font_01_sfnt_off00010855.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 16792 bytes
font_02_sfnt_off0001206c.bin
dd20b459bc49100b6bf88cf598b2c2937f4cae706e15f30dcc76bc310a28b81b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 11184 bytes