Malicious PDF — malware analysis report

Static analysis result for SHA-256 633643de896e1e1d…

MALICIOUS

PDF

103.1 KB Created: 2021-07-01 00:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f44c20a501bda3d2d6e5759bf04fd385 SHA-1: 0104dc98049a30c42cf6294329194925748157ac SHA-256: 633643de896e1e1d9687e2658d792051cf7dc47332f8e0d68f80a7d27e979602
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The document body is unreadable, but the heuristics and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a4cb73d4---26834431580.pdf
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/sapazevejize.pdf
    • http://angerdress.store/ckfinder/userfiles/files/90288450315.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63548ade---guvipuresapawulabe.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33c83c248bb36652c329faed9265f22f/fekob.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b030e4c4---wukamojuwewajafikatunexo.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baad24cb202---guvakimevawugukowam.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769994c3d37---71646627906.pdf
    • http://greece-ex.com/junalijiriguwikepilo.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3e92cc1a---bowojixabexadesolejesipot.pdf
    • http://hilltop1976.com/clients/24685/File/welepodokuwobodesu.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b35c1274c550e2d3b18f4c1d99406785/64753792908.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/era8c0ohnc2q0k762maarb584h/36543808071.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/h0ceo49682hbiia2imco0dpc5n/77827665462.pdf
    • http://terralindahigh1981.com/clients/866868/File/tesobokesudigisezaluja.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/47637559474.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c00d4a08d473dba94b4aaacdeb737c2a/firajuvidanufoxe.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714d1a87566---86423708138.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/59934255427.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/22b710414e1caa60a71fed9fbadd57d5/sugekuxopezeb.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/molidokokipek.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/325ccfc8a196e5df0fd93320411202b2/nobaruji.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210609045023160.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a835b400498---zaziwutejonowokese.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16082c68b4f826---52403979783.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=easter+lily+anthers
    • 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_off0001328e.bin
28831b4ca00a80e43bf3a78f6ac81a09c9a8f44da9517ee2504a97cb128ad041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 17648 bytes
font_01_sfnt_off00016081.bin
31b3d7ac8cac76e85724d88db2ed8da64ecbe93ad1b6645b563a0b88b8ca80e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16081 10180 bytes
font_02_sfnt_off00017737.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17737 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.