Malicious PDF — malware analysis report

Static analysis result for SHA-256 0525dc770e7b859c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 05:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5bc318e7d6dc27e5a16018ce0c847c94 SHA-1: 597abfb07fe9f248a3b5a7eaa2fdd369a0e55775 SHA-256: 0525dc770e7b859c255a95d4d83b2e5b1f41c006ed662a5a561c6c30dc98dea0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smsenerji.com/resimler/files/verim.pdf In PDF document text
    • http://wintec-samu.hu/uploads/files/1550975029.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ogd327th37nji3t2pj29uolfap/sujivizoboladusina.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/58119589339.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9da83695f5a2a896c4245b5db3508ab8/72560236846.pdfIn PDF document text
    • https://numberonerevolution.it/file/23643082935.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/82828807998.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210803160242534040kgo4g3.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/bogemuwexax.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/rirariru.pdfIn PDF document text
    • http://12shio5.com/contents//files/49026159377.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/pajiramutesiz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2f9c4df7---wazigamogavevukupe.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/pugumetubusutegu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911b8385b45---sevalarefunabofazoxuni.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac4204fb2---54366710395.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36d06b85ff---94106174700.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/labefoxumesezoni.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e2d90568d---42318982454.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/77445001606.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ie7ekmf9vao4718afs9cujb98q/28902602689.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/u5ocrf3pnsrqgo4tn62frarhe7/91468356925.pdfIn PDF document text
    • http://mfahk.com/upload/files/lomudubiluta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=top+10+horror+movies+tamil+dubbedPDF link annotation
    • 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_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 19120 bytes
SHA-256: e0a2a63a4bb6f15bd0cc577102eac3c9118639131b5cbabede2afa512179bd6f
font_02_sfnt_off000138aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 10996 bytes
SHA-256: 120a6221c93cbdfd006c591423456c409b9d7f9fa18e87bbf662dc93d5191ee9

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