Malicious PDF — malware analysis report

Static analysis result for SHA-256 11562835ff3d6326…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f7d25e1b93db199c34394c5b865398a SHA-1: 2956b675f469b38961ac85a53064fc06eef79803 SHA-256: 11562835ff3d6326804346078be231938d07fc2485c6526503a4e291aafc16ae
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external URLs, some hosted on compromised CMS platforms, likely to deceive users into downloading further payloads. The presence of a 'download button' heuristic further supports a phishing or scam-oriented attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=dejl+karnegi+pdf PDF link annotation
    • http://laser-piskovani.cz/democms/userfiles/file/7776003141.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/86695116103.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/logomeg.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/fiwuwatewe.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c49ba282a---wosekivid.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/dapuvixurizewuriw.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/72c3f8b603eb37d1dcef3173d774b205/zoturuxunoga.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/72969355436.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/12002095645.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/80972023490.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3b1gmv89ppoq8b5c12ahu798q1/faferiwuvowesid.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/56ba733d1dd7e55fec10376117320bff/xexivifuxawavuzitisikubiw.pdfIn PDF document text
    • http://htwy.com/upload/file/74739693960.pdfIn PDF document text
    • http://lecostationery.com/files/file/10958294862.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/kibitimivevukipokadipisaf.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/soliwutorawokak.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/linunivajixurososiwupar.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021914_21011_104.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/27400886179.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/robebidiwofogutaxotibu.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/kumumusarom.pdfIn PDF document text
    • https://digireg.si/upload/81437936087.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/vakuwajugixarakutufapu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f694aa07ac---33166120016.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/pupobuxagexuko.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/favepapitebo.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_off0000c600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC600 20064 bytes
SHA-256: 2f727a230728d7c3dcffb6b1d99626fa4d9d86b9548a41c2cc33a896f38e2ac3
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 10508 bytes
SHA-256: ffeaee412a78c4928a23c2c1b0df6a719056a05d2084656510829cad8599e99b
font_02_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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