Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc45689499a2097…

MALICIOUS

PDF

82.2 KB Created: 2021-06-25 20:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d91eaf0a26b2a3fd2dcba87f7c5f8344 SHA-1: 9dca4cc119732a14ec8b49401a407736a5b8af21 SHA-256: efc45689499a20970782f7b950eab09822fd6cbcae468c476b81b522b7b74876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=ge+zenith+zts+transfer+switch+manual
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/8a7cvadboi8li56d2v9l2jmdvu/bojafowoko.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/hom02hssm9l6p5hsblncv87803/vuzuzaj.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/add34b63add9affcc8ef9844d61e7b9a/fozofujolokizakivuweb.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210624170119.pdf
    • http://matstravel.ru/userfiles/file/suvovuvuweruragafikure.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/13faec6b5411ba484604fa1595226670/37710899149.pdf
    • http://mhinflatable.com/upload/file/64358025975.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090305bd7352---zabadibazutu.pdf
    • https://amatnieks.lv/pictures/image/ramulapamebuzavozikejosan.pdf
    • https://noblacklist.pro/web/img/podborky/files/11264646924.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/hitfc2hbc6utgteb4v29ae7jf2/66409645632.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nu5cjs49e9mi5lhafeghq7l4tf/5357892403.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/30e7b92b4c84a4370c8808e29dc97757/3105718916.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0c87fc70041f86ad780b3a590c1075eb/23609779492.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/64d4d9483e7fed2ea94baf4fbe770e96/muwidizaluvejideku.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5d3dbcda2---64842165730.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608c970a1d677---5958172312.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b253ef05086---55479094039.pdf
    • http://abogarestudio.com/userfiles/file/34963931230.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d36e3e2392---bibonikevulewawobeledepop.pdf
    • http://teenaramainc.org/clients/875997/File/90547833921.pdf
    • http://lideparts.com/userfiles/file/1621392661.pdf
    • 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_off0000e119.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16792 bytes
font_01_sfnt_off0000f92b.bin
f89382f8e8d97e2cc97066ce29df9e92ab42541f39da4d190625965cff644c17
pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16132 bytes
font_02_sfnt_off000122f2.bin
1017c30703b48fbc1ed0c5e63f1b8e259198347dbc4a9cd53a158743b932c782
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 10768 bytes