Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b72304a5c1609d3…

MALICIOUS

PDF

82.0 KB Created: 2021-07-20 13:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef94dd378fb5f02a3e48e910de9e0bc3 SHA-1: cf539d920c8cc428a57666f80104b66390057408 SHA-256: 3b72304a5c1609d374f91d7955cbafd5844309d35b18481a15a854f43795e551
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to distribute further malicious content or facilitate phishing attacks. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c2894ab2---buzazozemejopitapifikot.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6ac6301ab43474f0423e97c721fe8d9a/51742287690.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2f32c0394---teloxugu.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/terelinulurikuga.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/81519576478.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076499b11b37---56815837321.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc3414116---51405264808.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0601/06342b6aeddf5ada99fd88ee1a240f67.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k56vk2tusrjbqsujvsqdahig46/87997475325.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/piwukirerumusisawaxu.pdfIn PDF document text
    • https://ksuskalology.com/images/file/10056963723.pdfIn PDF document text
    • https://egf.tw/test2/images/file/gejilijuw.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/44717998940.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/16637338094.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/86998037842.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607822b2936a9---61429380101.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608a059d4b686---6397831323.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6b8ce75c---28374508270.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726722465ef---dasivewasubimulo.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210705_87E05083D241BB32.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/tegebalivigoxonipifadaje.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/sekujesukakiguniranogexop.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/810d20e7588bdf25126cb1f55b37c59a/mujixuxufojepinoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+quotient+of+a+number+and+6+minus+3+is+1PDF 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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 18388 bytes
SHA-256: 0046212e5665673e8545a7171249761bf0ae646f2af1904dabedad5f1cdae304
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 11312 bytes
SHA-256: 28b81328f385f38e055af44cc1095fc12fff0d1fef6df7c19d5a665aa08d36ab

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