Malicious PDF — malware analysis report

Static analysis result for SHA-256 5108ffc831adf88c…

MALICIOUS

PDF

84.7 KB Created: 2021-08-17 08:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d6d745111a54f5e8c5fc7313ae58ac7 SHA-1: 639a80b68441c9e5cec9dbf78ab786f8332e38f2 SHA-256: 5108ffc831adf88ce667898b8cdde3af9502349f1e22f785e444828f89ea83e8
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of these links and the heuristic firings strongly indicate a malicious intent to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lobanowscy.pl/userfiles/file/ludikovikigiwifef.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdedc54ccec---xerabipafifile.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a59d7ae23913681a6b52a5ecab7bc7cb/64518040560.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072076803e44---6280646328.pdfIn PDF document text
    • https://caffedisanto.it/file/zenivo.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/31862599232.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d331da5549---zibomageku.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/dalujuzanulefijasi.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/44736977858.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9fcaeeed0---favuzida.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/75735976292.pdfIn PDF document text
    • https://domilot.com/uploader/files/54929088011.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9b947d59fba740596b0ca8a21158e46e/sufupolanaludulazepadujib.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/13772723199.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/fidadavimerajujiwowibas.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/jakonatomokujilojevit.pdfIn PDF document text
    • http://placc.info/up_image/96444928365.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/94216883586.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a61ee3d44862b1270ca923a8838da298/40723330691.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/38420098557.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c8f25a87540566fcf500c4ebefc3b59b/suwutoxobe.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/71be3d22f2b6eff7ba8006747f994428/wolukesapetakomikuja.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/5711826536.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210630082142157.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/82524668535.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/libovajoxebejejulisatutuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lg+inverter+linear+refrigerator+costPDF 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_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 10536 bytes
SHA-256: 2e0ed2f6f8076916fba8251be28b797a8b9192a81c6ecff0355d9175c32c027e
font_02_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 17392 bytes
SHA-256: e95b0b2f4f8ee2968248d71e46f71db8b09527329cfcb2457e4879df31242367

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