Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f6577ee7a507a9…

MALICIOUS

PDF

79.6 KB Created: 2021-08-17 15:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2d4b7bb9022c12a2e1f8275b8eca20f SHA-1: c9c4ec54262ee6c5ea6e0104ddbb39473e70aaaf SHA-256: 79f6577ee7a507a9fdd1977847cf17a88052ead97d99b7d8d41a53084e894f4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/33623702101.pdf In PDF document text
    • https://cmsschoolkg.org/userfiles/file/xinarewozodoz.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ea5c88b7022aa91d1e4e2d4c7003e2a4/83555158526.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/xakakanuza.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/88417292124.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/sipimosawemeturuvo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/422e4907844cba92f5156d50714f57c8/40292773759.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/52295974476.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1651c070d---lifagutoz.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/pokazilul.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014083c834---suzesedomanufixojoli.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10df06b69a---79289013682.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/jukeririvejizadunebupaxib.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/df8f84d335803f08981d5e0a66dbb0ec/23259390820.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf2008114---wemetowutoki.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sivorinidarogija.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/duruzafopafabajujukoxu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53d4cd6011---86809657155.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/95892439967.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57ddee4a9---23976717910.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/kibuwu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d4681da1918---sunofilixosowariveruf.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/rovufegojokusefawa.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/56247244199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=semiconductor+device+fundamentals+robert+f.+pierret+solution+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F2 2916 bytes
SHA-256: 13ef1982eb54dcbd69b4160dfdcb56529b355e61c46385b278066c7596a9742a
font_01_sfnt_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 16476 bytes
SHA-256: 67c0981fbf49310536fa26aa14cd33b2834c224fc445559e033cab6c05f559b9
font_02_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 11228 bytes
SHA-256: e642f47071d6b3d59d812c1eafde26a75e7c35c0dc1786793a306647fb3a2886

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