Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ed8ed5b130212e…

MALICIOUS

PDF

105.4 KB Created: 2021-07-24 14:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78866468151967372496c971b91c166b SHA-1: 8468a0b6110f81e40786082d25e154d7ac995cd2 SHA-256: 61ed8ed5b130212eb79c3aa797f6fdb60574d637dfe04c142f338579366d6c79
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, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of multiple distinct hosts and the use of disposable hosting suggest an attempt to distribute malicious content or phish for information. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://k-yoga.org/file_upload/spaw_upload/file/20210507024048.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/kb4eo9n6d0nvn4ha80o1h29vtu/58192358477.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/31356795205.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hgr1a721mt5k62ph319m3vo0ag/21784368905.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/62594429186.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90f77bfe5f---68973840108.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/ce9a07ce9d4e1375610c517427e85673/gekakesa.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bef3eb9bc---30563716828.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9uqjcevt47fpt9iu2pob9disfb/4996098436.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bikaxotu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbabd3e97a---13281209339.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce005c078c---ganexunep.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3bc0855c7d48e7b67dbc2145f5e56028/lokanewo.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/52453303122.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2a2msqpl32iqvvahlcp8g7rb4o/89208739790.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/lonuvutojoz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vvat41mj3ue1nai5vj9t6bbhnp/30945263810.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/v44dbqhs95r47sl4cqv07k1lgh/95235623519.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/nakupek.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c9006165a---74095626185.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/52429078564.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/ravagudikagigajususuxafe.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/q6is4g28on0pd4fvldr24pta3j/80421431557.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5503c36c47---kobosusizixaxarorito.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae74b026ec0---jizixobofumewopipu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7715ee5676236df7e9efa10ac0a0c222/dasanutawad.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26644a5df6---2291676536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mathematical+physics+with+applications+problems+and+solutions+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_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D44 18092 bytes
SHA-256: 8e0ef23400e8a7b125c107d38dcfc928631b1c759d7d072b979893c6511d5c32
font_02_sfnt_off00017b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B64 11320 bytes
SHA-256: 31299d7b90e7abab938ade239d7904553be323498b0688215c8b586ae443cb35

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