Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d20820f2c1fd58c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 06:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: deebb18d8f227564522b0e7ca026cb43 SHA-1: dc718b17bb36e5004d674ad345906a0a230dfb58 SHA-256: 7d20820f2c1fd58c314056d4e085ceaa0084b139e33faacac7618c0ea84eb04c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://teraval.cz/res/file/bebidima.pdf In PDF document text
    • http://sowa-architekci.pl/userfiles/files/68030900080.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/61094153851.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/36167340062.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210902100819.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dfc62306d---vobunagamepubutelab.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/widajuzaziwebubisabe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f55b0892b---notolu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mlsiuo181hrr9khlhi2cl0q2m5/nebuja.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/laxedexufenutopodojirep.pdfIn PDF document text
    • http://egitara.com/upfiles/files/58074383568.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/78521168879.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/77258827482.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/24067356962.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316aea6a3dc---98122750414.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/5139643615.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/02038639ebc97d779f739b7c7ac016da/rexegutorumenetufaf.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613744e0eeca1---85346050061.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370d8492487---naxezerutulikirized.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7134a33a---92179672337.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/terepo.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/93384127525.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/81498720155.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/kozovogoretawuver.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/32829045453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pinger+textfree+apkPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/57587727797.pdfIn PDF document text
    • 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_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 10396 bytes
SHA-256: dc97283b1d6422d68798dd6c0aa6cf28a51bf47b16c15b2286597777ef190b02
font_01_sfnt_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 17760 bytes
SHA-256: ac35b260d0f2a671508bfcf6020540c65aff4687a572de281ade50b13d9390a4
font_02_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.