Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd0fc0352112965…

MALICIOUS

PDF

79.6 KB Created: 2021-06-28 23:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10d01da85c450c28d90466e5b73a8d90 SHA-1: 1e35073470b4c3f0cff9edb3c780679e2ded5a1b SHA-256: acd0fc03521129650c4af5e7ca9ea238cdb18ac29973d02686ca1436552d4602
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of numerous distinct hosts and links within the document supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pvcbnsho7hgiq05p16d0deav63/kodevegafisojewomasevis.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d20c64699---zevavulujalezoliga.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ee574758c9bb4fbf3ab12d78126dfa67/fopipe.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8acb3705a---vanivuzisewawa.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160901040ef11c---52218667248.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2c4f1fb0147610fdcbc8c3f935918383/97097750539.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/331eb3ae031267e0be993700ac0de60e/xefupugujonefasub.pdf
    • https://planet-for-events.de/userfiles/file/85147519822.pdf
    • https://chpcentre.com/files/file/5260072089.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a37c845d31c1534974100c2a42e83941/tuvedelutepetof.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6425e53239506a5a83ca3465fceaf752/fikabovifixegatijuf.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95fab75096---22207689593.pdf
    • https://perfecthospitals.org/FCKeditor/file/85677642503.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6dnkkc8kip2s18mgou3jh6rob0/54667293127.pdf
    • http://skikk.nl/app/webroot/files/userfiles/files/navexilebunisizulezowoju.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/1925c78008068fb222ba293e1e77a3b2/mosufaletaxifasinokoz.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c9898e030a9779b19cc26490d1368987/86733301119.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/jolumumejebo.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9e6gl5nd496st23v8pemurud33/fekijozovasosagafix.pdf
    • http://maslag.eu/userfiles/file/71282214875.pdf
    • http://pphu-joanna.pl/fckpliki/file/10649245496.pdf
    • http://medicaldistri.com/ckfinder_files/files/dujorasexewawowiretetonaw.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/98332cd75dfe03f9268ba6d287ca551f/fiviriruvepaviludunenagi.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b6f477f0---89651737818.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=thomas+the+train+day+of+the+diesels
    • 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_off0000d2bb.bin
dcbd90c61500415b73caf24f7497797c8f7b946507961bc0d91560b1ab9253dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 10696 bytes
font_01_sfnt_off0000eb1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 16792 bytes
font_02_sfnt_off0001032c.bin
d3bd6360cfd1053bb95d28d84e2a7110986363b3e5ced88a78ccf4e1959dd153
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 17444 bytes