Malicious PDF — malware analysis report

Static analysis result for SHA-256 058bc1eb8ba8a2d8…

MALICIOUS

PDF

96.9 KB Created: 2021-07-03 09:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 661d102f32500b3acf98e61d41c636ac SHA-1: ce04d75857c2d59cd6e2970f13c38540d5755690 SHA-256: 058bc1eb8ba8a2d83dcbaf535a70f9c003f779151814b2ef906b3bf1597afc65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The embedded JavaScript is likely used to facilitate redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ngoctraithaibinhduong.com/uploads/news_file/pugoxetumotirejakijawo.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/bafumibegenoxezodejo.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4160f53b04f9a0f1c3339d2e8722b251/ridamaxinu.pdf
    • http://alconburyreunion.com/clients/36523/File/repamuzejorire.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4361d4a3---susaxilenitoma.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/frvm52tjpg7l5iu20egos64f76/82199467631.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160794823e4101---51101911244.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mj9mv68lu5rvgobf0m6qs6tqf0/papozunetoximajotutafeno.pdf
    • https://chp-travel.ir/data/file/masumexatarinixifatebusa.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b45741c7660---90645011864.pdf
    • http://www.centralperdana.com/file/betitar.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c826366a0---xivakokibavokug.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8197ec34d78f41b52b484fd3bb6576b8/95723842123.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3nqj18poiubjiv3objl65u3ejs/bilenuwirinew.pdf
    • http://lexus-custom.com/js/upload/files/55198189911.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/90600233f2be28cc894bd5d057eeb56c/dipepodux.pdf
    • http://unseretochter.ch/images/file/nozuvagalubusikiga.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b483ee751c3---19080308645.pdf
    • http://iphysiology.ru/upload/betonudomufuvufus.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087469d91b39---61496135307.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b012fc5c414---89959072966.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=top+100+most+valuable+brands
    • 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_off0001175b.bin
642d15ddaf43912ff5785085b78a7f95dd1b774f5b0e05f56a2c64bfc05ad3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 17548 bytes
font_01_sfnt_off000145b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145B1 16792 bytes
font_02_sfnt_off00015dc8.bin
72e78a56aea9e6119a5474c45e3476569faa317333751f082aa4fdfaa65f30c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC8 10904 bytes