Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d0829efa6a8870…

MALICIOUS

PDF

90.9 KB Created: 2021-07-04 23:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca23313d7dc45b1b0ad800bab7950162 SHA-1: 89b26e1fda8a104f49800adba4c6caff1595a3ea SHA-256: 16d0829efa6a88704301810ef493f0979d93957c2fb6948529b1973bb4632896
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alpha-th.com/userfiles/file/sonosovugebiwulefaviw.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ff0260b04---74685384187.pdf
    • http://coinmarketsuite.com/ckfinder/userfiles/files/31486626999.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff0d4f3ff8---74461489159.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/95520675475.pdf
    • https://davaocarrental.com/images/file/pemepowegujujutazesem.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6294499d---bogelanawelu.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/lg76k5dht4ood38enti7n26nq9/nivasaxosuvirojop.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ed3bdab35dee0cbca9183d386d8f4c51/38447640054.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/81667016148.pdf
    • http://tradeweb.es/userfiles/file/fusokoxagudegedewibi.pdf
    • https://monographie.com/ckfinder/userfiles/files/70648845811.pdf
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/kisalovizibam.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4b88c8cb---64764725777.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160708f4127ead---tibuxigoviminaluxabunu.pdf
    • https://digireg.cn/upload/sumel.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d375b3fda47765d782483f112e9be131/gixazogonubijo.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099d761b8ae1---8112505455.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/h9gt76o8espd7832lkuei00f95/37435754558.pdf
    • http://mai-colle.jp/userfiles/file/wukusizujetibum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=imposter+hack+among+us+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e781.bin
188a4c9259b63923d156589a644e7cb4bd8e536439d925dfdd2927f138467090
pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 17536 bytes
font_01_sfnt_off00011531.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 16792 bytes
font_02_sfnt_off00012d42.bin
7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 16752 bytes
font_03_sfnt_off000144d7.bin
cf07b122472f360f2841c664fe123aecac21ebec0c5bec1de94f5515d7ed3c32
pdf-font-stream PDF embedded font (sfnt) at offset 0x144D7 11056 bytes