Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6da0ae8167a98a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 07:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0c7325d9317768f501e334034d092b1 SHA-1: ac0e587c44c2546e63540e31c2fba4d022a414a6 SHA-256: 7b6da0ae8167a98a7c52bc7786c762dc4b5af3af0791fd1523200b71bd75c524
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://joltiy.ru/uploads/files/50623151032.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/52f2go9hob48p8ilcjcvv9rhr5/39903312637.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/jusajufokukapum.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a617072d4b2---79642684724.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/pepixutafiwexejapejaxu.pdfIn PDF document text
    • http://tano-cable.com/d/files/nixodumijimalinesig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f18a8674b---jilifafefopegepobepifuf.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/46752760374.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/79984290300.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/97877383032.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/21157069747.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/1293773116.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/2244551889.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210710_FEA77264282A000F.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210605133350.pdfIn PDF document text
    • http://polipack.ru/content/file/vitibegezilemaki.pdfIn PDF document text
    • http://master-br.ru/img/file/vamebejagon.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/masoxes.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/60185103110.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/rexiguvogujatabepizej.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/gixeruputijekobeze.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/29784133869.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/posabozibuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=abs+cbn+tv+plus+manual+channelPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210722/16268892764746.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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 17928 bytes
SHA-256: ad54592f4f8dd114a89b7e2348883c8eb0aea23c71a37a58b17ff30e1e39347b
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 10616 bytes
SHA-256: 6a27c4161e3bc73ce8e3ec03be2ef42dee83c54e4bf6ab7c61ddedc4386f21b7

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