Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c611c9be6e662f…

MALICIOUS

PDF

87.5 KB Created: 2021-08-08 05:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9928a720ad1561fba61ff45231df0e1d SHA-1: 1f1912cfef0bf776693f0ea9c96d766128f58d2e SHA-256: 71c611c9be6e662f51440fa204f25c192e2f9cd27387eee740bf671c372df83b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm designed to manipulate search engine results. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://autoshiftbid.com/fckeditor/userfiles/file/15791426375.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb6aa3a87---sirudi.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/90062379352.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o5j07unnoj4unqvnbas1phjgbf/61651669657.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080afee6e4f1---rasomavimi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/748425d9417a3d9421099ffdec86685f/xanerirajo.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/42141651668.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/42934411089.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/49616979480.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rakugobezimanamam.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c966111e53---zufupifarikugoz.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70b5ddd419---gopukujadotewuvebexedodo.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/rinejerabafupowevo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/7847163438.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbcc61bbf---86620122372.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b4847e47b15e1050e3c5b39b6f62800c/20859667831.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/mikerem.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/liguzumawi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j5lkkkocf7o3vo59lirh6ppn43/minogujepusowalomuwasab.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/79708606571.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49eabd33c---dokalerewulokewuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=3+digit+by+2+digit+multiplication+worksheets+with+gridsPDF 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_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 11688 bytes
SHA-256: 6d1da97512085f7f2c67123fdbbc42b2585cd7d6dce8efc2a9e449c637610925
font_01_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 17700 bytes
SHA-256: 77e8902c7a7842390e32bf5f93f6f8f217169a331e58d8f76d88d7fb44805975
font_02_sfnt_off00013810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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