Malicious PDF — malware analysis report

Static analysis result for SHA-256 933168a765a610b8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 18:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b7ca925f529c420675c53382fd15784 SHA-1: af90f256afee888e5835db1b46d047f0803ea73f SHA-256: 933168a765a610b8abe676ce18b842ee082b92c9954d589188dcd4dbf49f6fc2
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of numerous unknown URLs suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/63894402890.pdf In PDF document text
    • http://dotbamboo.com/file_media/file_image/file/getegimibikot.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/85307192154.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/29626574463.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/58111016548.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909110440.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/9035298357.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/89528718192.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/83320094708.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/46749876777.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df2df40a3c---fezabapiwodixilafunoraxen.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/naxamewumelilaripegemusok.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wogojisogitelepebapadaxo.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/rerewevo.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/toworelejegoluvuba.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/31613443444.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332fa7b61dd---kakiginazigipotagikeg.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/48139167969.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/gubekalowidovafuxesevonak.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/431fc165b7bec7a012ebe5aee7160428/88777886377.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/nigenepurumuwozudagudewe.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-5/20210905170312738864.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e44e16d4121503e496326ae49b55fb09/70704973914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=wwe2k20+wr3d+mod+downloadPDF 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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 10636 bytes
SHA-256: bce041507dfe0adcb39b5b1dddcb120569c48328ed97aac59fe75510f728aa90
font_01_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 17124 bytes
SHA-256: 24c52450b2bf9796ca733f7bb41256380e4c516d9e05dab42ded0c9260bf3808
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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