Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d68ed3fbcb254c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-08 21:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a059ef9dad2242196479f13461a6ec2d SHA-1: 49a678f66ce648e33d1b9b30f8cff23a96f518c2 SHA-256: 20d68ed3fbcb254c925ade7af0030265024679fbeff63fad9f223f691227ac67
156 Risk Score

Malware Insights

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

The PDF file was identified 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 various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351200d5497---49954389824.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090407101858.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/nefaxazirulunaletas.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375ef360939---vuzagolaf.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/87362671864.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vobtqupcc5pio1hoa5hvta1osa/wupinonobineb.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/49960936866.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132537fc9646---nugew.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23345102513.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630631964.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161315946b1c05---59031335529.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/duvubovalukowolif.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///suduzitozoga.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/67125411801.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/80443691844.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/koxanutivolupibirepi.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/resikejoroxopakojebu.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dovowitetimugesuwetis.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/33646815556.pdfIn PDF document text
    • http://grimastone.ru/files/gunewefadinosadegedudaj.pdfIn PDF document text
    • http://domainecomps.com/documents/files/76557851300.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/pilunafewavizab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sources+of+criminal+law+in+zimbabwe+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_off0000b081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 15076 bytes
SHA-256: 5f44a18d8a813de6231fc54feef460a21d25c549e830198d88045467907ee32d
font_01_sfnt_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 11144 bytes
SHA-256: 54a2dc1d7dfb75326dc7f9e5c6f733f105d356889e1187c611c39fb2a919d191
font_02_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1