Malicious PDF — malware analysis report

Static analysis result for SHA-256 19013c973897798a…

MALICIOUS

PDF

78.0 KB Created: 2021-07-15 22:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d0c05cd96aef677541f5304ac5bf4924 SHA-1: ca30ad5c212a6d5066d87087b21fc8eb72b190b1 SHA-256: 19013c973897798a95f9dec2455daeb092fb5f1ad2906cf84f4e36c9563c8043
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and Trojan activity. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://chcial.ru/uplcv?utm_term=ideal+weight+for+male+5+foot+9+inches+tall PDF link annotation
    • http://axwelindia.com/uploads/51171489613.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/85741338277.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6959e5420fb7a1916d2006c24c076850/gevevod.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/056e571e034560e1987b0d9718baae88/73321788949.pdfIn PDF document text
    • http://midel.me/userfiles/file/lemijatefusuro.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/431feba9bb7a1a3ba2775119e5816835/7215563254.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/vuzubevimadofuboze.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b352561160---26696379624.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84437e133---rusotunipurulivipixamim.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/79ec5069ee1e2743b29d5328d30cafd8/54969521668.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17052246729.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d5837dd98d2b9bbfa46040af6866a6c3/22112170238.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fe551aae7ac0ae3ee00abc3c5f098c3e/foxamilavokobib.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/vubezipozoxabodoxuduz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6db521d250---48060044721.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/24417799262.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/66720576866.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33954973617.pdfIn PDF document text
    • http://soupworld.de/upload/file/30614726034.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1be66fa6969a2754f406924f4236ab63/vibufibiruponekegebesipaw.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/352b1fce6c49f17a57713d512b14f2b1/topolisujoxogezo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xonenevuzefoka.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59bb55205e---54154266732.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sabefa.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/63687440442.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/5012870177.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_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 11260 bytes
SHA-256: 85ab360a5ce4bc80c269c240f79273b3a56de9d991a0db044a2f05d99393a55c
font_02_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 16688 bytes
SHA-256: b6df35dad6a7c43009c5e2c30b412f1e5df7cf86acaeae6fcc8a922ddd01d819

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