Malicious PDF — malware analysis report

Static analysis result for SHA-256 274a71ae4ad4e938…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 23:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb39576171824fec5b4aa5b442cbd057 SHA-1: df5e2f5b5233d2cfd62ac4b5b8b999ee51561646 SHA-256: 274a71ae4ad4e938ead1459aeaaa4375ccc437de88ffbdb6c01d8b5807a75e85
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/06f52e6109d65d479ebd1d98f7f92b2c/lebufefezutulan.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a56d78413---daxolijixe.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9fd4a2858---37478200956.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/03aff98c6365d3534e5346230aa5c266/lotefoginidosalerapi.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a21ed054b---99413187674.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e551b40058---xasegogafagu.pdf
    • http://prestopc.it/upload/file/ripovopazufezunis.pdf
    • http://divorce-difficile.fr/userfiles/file/12217584242.pdf
    • http://lucann.com/Upload/file/39883971564.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6fb3b18a---66778319620.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085681a8f508---garori.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3d5c976d0---zowuveleda.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7265ac699---92645720768.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a9089ed7d8d43036f7a0f355f9396800/92711459048.pdf
    • https://bem-sa.com/img/file/sevopewugavizipav.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/38590562c96c9758f0819bc7daa3deb9/27500518045.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3d18f319b1c3c84946767ff32afde31c/doxadodogavifose.pdf
    • https://al-farh-iq.com/upload/userfiles/file/jikabujigomisikevilolipo.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/84453957413.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba37a11575b---fotesitalesutizuxufakij.pdf
    • http://alhs1973.com/clients/64426/File/16046893033.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mo14nthmu8v99jpbipgoclff5r/mematalatotodepuri.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac654d8593f---kavekofobemewetezisitukaz.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7271baaf6---benufelivuto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=reasons+for+hypocalcemia
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec26.bin
ce38a4cb77cfe7a1eb97afba4787d53a2bf2c3509050368f239469fca29b4784		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 17092 bytes
font_01_sfnt_off000117d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 16792 bytes
font_02_sfnt_off00012fef.bin
9d343242874509a81cb284ea7fc7329dea23f98a49754cbccd3cef3e1fe68257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 10804 bytes

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