Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fda2ec2294320a1…

MALICIOUS

PDF

93.1 KB Created: 2021-07-24 16:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e17d63ff8c46e2de61c2e4b3c9e04ed SHA-1: c9bf23176810c7fe9ccbc6898f98c2afc3587545 SHA-256: 4fda2ec2294320a10aa927e0437b42350af3f1e73d995076e26e181dc13d8204
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23280db3c0---2023661237.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f93743f392b5566d105e14f8eb03958b/30398619881.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079518428561---mepetenod.pdf
    • http://xboxheerlen.nl/userfiles/file/pafalebitatiduvap.pdf
    • https://gelblighting.com/userfiles/files/vexitiwiluzinonu.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4mbscnigmfvgufbgfghqhfcpjc/jokusux.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7801e3bc7---wajuvavusapiguban.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/16360216606.pdf
    • https://bahceneryaman.net/public/content-images/files/11313733019.pdf
    • https://1877painters.com/FCKeditor/file/57168898982.pdf
    • http://biotop-zamosc.pl/userfiles/file/48506677583.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c832c6959---50569545355.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4bdd1c75---92115401662.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d69087b8---15924479730.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9b34faafdd41b9885a4987ae15794eb6/ronofowuduwadavifot.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/s0rraglf9pr8n7se95t9pmgdq9/43760073020.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5145223d---25815701533.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e120ac236---13981769547.pdf
    • http://thegioidahoacuong.com/uploads/image/files/51260853581.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dde8bb60d792a2e384e8bcee4f2cbcd8/jerezexub.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a43d122237---puwarabakovuxegulezejizo.pdf
    • https://nilsahost.com/calisma2/files/uploads/toparixuxod.pdf
    • https://srldirect.com/ckfinder/userfiles/files/89403375889.pdf
    • http://sattosushi.com/uploads/files/53478787464.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/526ef2jmjrvbn2irdrco3mess0/66794320191.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=funza+lushaka+online+application+2021+opening+date
    • 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_off000105b7.bin
6aa98ffb72020b046e5c141172c33dd522e31cf7fe40e374c4adde85768f1591
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 11216 bytes
font_01_sfnt_off00011fd0.bin
384fb0f073be764030b9d9c6527446a8cbfd4f28443583c4eaf1bed91dc534af
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 17716 bytes
font_02_sfnt_off00014e45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 16792 bytes