Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c2cf7b2a87b254…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 14:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed90b142d952122ebf209b7f3dbf8e08 SHA-1: 00600a879b6ce4f93c3c6eeaf266f123324a4913 SHA-256: 72c2cf7b2a87b2542b2726b842a0073d7bfdd1413861d820dc93593e73fb0ecb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=how+to+change+refresh+rate+in+redmi+note+10 PDF link annotation
    • https://iohrp.org/f_files/files/10917421300.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/56962581217.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/pusejaxalezefulum.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/27725029517.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902050746.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/r3us46qhs145kn3v4dr2kuno2h/43268365569.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174dc80c15---59444919675.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/zosizivegupapizajulor.pdfIn PDF document text
    • http://a-pluset.com/userfiles/zakilemixa.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/likavotesusebusijexu.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/momedolidojalalogagu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0fe74249---70592456834.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/93721254621.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/lopumexijepisuwup.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161412153841db---fides.pdfIn PDF document text
    • http://moneymaker-gold.de/files/9954244640.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/54365401562.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/medopawamolizawumimuxa.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tetaremasuritopoludalixe.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/mofofazaga.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/47886327186.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/gavudoku.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee05a59109---14198239738.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/48130246665.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/fudepusulumopugut.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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 11128 bytes
SHA-256: 3ea90162c5a9981e6bf482ca24a9ea827e2ff590df24203f6ce1a6e0e9922348
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 17536 bytes
SHA-256: 7489f0aae2e7a07c0921b973cbbdfc1ff5646a500ff43e1bfe9201b1f4e13cc1
font_02_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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