Malicious PDF — malware analysis report

Static analysis result for SHA-256 e923375175966a02…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 00:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 514e96072db0ea09daa130c44714a6f9 SHA-1: 275cc95c63207ffcc2968756cc4e485de9063ac0 SHA-256: e923375175966a0293b078e4b2b113edc64bd99a903dc7e308b59d890e845d98
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6b4494958bac83080b76e846372103d8/34617064219.pdf In PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/81023050546.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/29434351994.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/3313136431.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/89880980152.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/meropawinafonakedan.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/xuliliridex.pdfIn PDF document text
    • http://llux.vn/uploads/files/17426767355.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210629211313_5h4rp5.pdfIn PDF document text
    • http://ccsl.asia/files/wubiratiwavos.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jozezezomoneli.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/tujukepudimide.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gilosirofof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca47c509a---69443537156.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1clgks55tq06qkv6vhsae2241/sawawegegalixinenudise.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/90288452846.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3664bb2d4543351420b64b4b88b41973/66022937923.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/84162594494.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/gezatotofojeli.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f07a0c2b08f---fotazedoledoda.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/51623751194.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/25818697140.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/rawez.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/nozavixugesori.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/nefufakomuvemuxidoma.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8o8hbu4r07o6gtbe88lkalg2l1/67714805037.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/87479821236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=in+vivo+exposure+therapy+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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 10880 bytes
SHA-256: cec62c7af95f3b03cdb3b134616905e075bfc68a307d5d31d15aa57edf3c36cd
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 18124 bytes
SHA-256: 760a93b772523c86b94b05f2daeb956d2afc5c00a8d6700cd52eec5853a68a91
font_02_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1