Malicious PDF — malware analysis report

Static analysis result for SHA-256 a038aa82ed61720b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 06:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd7871f0810800bfb78644d05a77fd0a SHA-1: a68818b57532bc3c76740faffba24fd546503913 SHA-256: a038aa82ed61720b03e7429500a2a78bef5d2f5c0c1368f86a881fbdef00ee52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF links, many with UTM parameters, suggests a phishing or SEO poisoning campaign aimed at driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=how+to+hack+clash+of+clans+ios PDF link annotation
    • https://medsplus.us/admin/images/file/28245427996.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/muzedi.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/13283531265.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/gakubipoda.pdfIn PDF document text
    • https://denimder.org/resimler/files/fasubobijokex.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/24855092736.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ocme9ae5fal3pcltodmn8dpgoc/82422233701.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/kipububuvamoworade.pdfIn PDF document text
    • https://kulittelor.com/contents/files/16202195926.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/44489618522.pdfIn PDF document text
    • https://recrut.com/files/files/72321694738.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b7af05c98---11850174166.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b625bf83b---64449329120.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/27233943267.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/votivirufola.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wizorijasupavufibapubura.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/mibod.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/88948396214.pdfIn PDF document text
    • http://artio.pl/files/files/20861535577.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/98259742844.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c33830552f---87560612380.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613683137649f---19705594183.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/seviditofon.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dd983de3d142b650d581b5fc42efeaa3/55834003681.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_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 17856 bytes
SHA-256: ef23ac8b9ac5056f9c6430f6930e45e9e3df877cf721de1b11d425cc2e0d0c1f
font_01_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 10368 bytes
SHA-256: d528aada15ab38c26ac851e40d52b76b00a7f1e2ea6a7d527b458ac35fe19a9f
font_02_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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