Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8f616394b1cd72…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 20:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94ee5eef6182c917e5e12f6a148ae7b5 SHA-1: 4543b4ca50cedd9c1f0f16e3fd61e8491f3af507 SHA-256: 5f8f616394b1cd7228f481276f68d53b87361c538dd69acf6a970c63ae3d5c81
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, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and other disposable hosting domains, disguised with a sheet music lure. The presence of embedded URLs and the heuristic firings related to link farms and compromised CMS uploads strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=oasis+half+the+world+away+sheet+music+pdf PDF link annotation
    • http://leaguengn.com/userfiles/file///womojikotexu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b4536ae6d199f3e258d129c7b2d73544/lifozaworinajitevajakig.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/sefj7qmq3ams96f4iph34imgt6/gazujano.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/49pfuc5nahrbulvslsncvj0b25/18025393933.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8103418e7b49741247d060145dba4b3c/30983397418.pdfIn PDF document text
    • http://zuche0551.com/upload/file/67337212526.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/95927760112.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/pabebewititinaxufewavewu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e892ebdf5d27fa6189d1fb2a1ba57084/xaxubodinuwixufipoz.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/61041921779.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133c64db6b---vosukadumo.pdfIn PDF document text
    • https://polandpools.com/contents/files/41634645117.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4rpl4du9r0879arjsk8nu3cl35/98374306881.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/parowotamunot.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea9ee3484---masona.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/zexesemiwovo.pdfIn PDF document text
    • http://serting.eu/userfiles/files/semidalob.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ba651c22bae17c8aee7bbd0096306540/15377477567.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/827d55ab03eb7c857be7993d2444c7fc/gurasetusilamibegobubove.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/diruzodaleze.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d35435b8ed5065a744ab5242948e56ef/salawo.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/gudinedamitugigu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748438d2ebf---24315575894.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/9869075262.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 17008 bytes
SHA-256: f83d72b5aff0fa2430ecbdd1f242b6a3d183c092932625f9e30fea6c3afea8d4
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 11108 bytes
SHA-256: 7ba04c1d27ebf8630e098693ff63907e550c1ec209c92690222c1f93bf079663

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