Malicious PDF — malware analysis report

Static analysis result for SHA-256 52202b2ae89b58be…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 09:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59996ab0ddb5e81484daab7ac24b7769 SHA-1: 4fc11a38839d3303db22624246e738031414ae8f SHA-256: 52202b2ae89b58be95b7c1104e98a2b4429ee6291e613f850ed58a1e451a7d66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=god%27s+chastening+in+the+bible PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca88dad68---85645401483.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202108281812029580.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/ritupipixufaxejebilal.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b83f65bdc9---84169976661.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7260c667---mexabaliv.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfeab15e7---11916339969.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/65013326162.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pavumozuzop.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6pncg25rletrk5tbpv6lik3as8/boregok.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202181003556904.pdfIn PDF document text
    • https://soechi.net/userfiles/file/87249348236.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/dopar.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/dowudifo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35a1fb4b7b---35652469935.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/93318829226.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/aqb151jc1rmkj6l41mfa6ufeg2/xigowofobudedumepisolupom.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f50c878f74d2c741a1719973558fd9d7/71786857331.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/62279769070.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/49933979751.pdfIn PDF document text
    • http://nfc.soo.jp/file/61301959662.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/14809609688.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2ffa88c30dd670b96f98477bdd21cbc9/lukokarifezejuloxiraj.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/tidudajinuvuz.pdfIn PDF document text
    • http://simonide.org/userfiles/file/82538201464.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_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 16984 bytes
SHA-256: b58f68d41fa4f9f8ba02dc630c0b80ac95b84644f6a8cd065d924f8839bd0eb1
font_01_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F1 10760 bytes
SHA-256: 62ba68455b1f48560e3c7847765e2594c572957551e5bf1d1fe23e3354b37f65

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