Malicious PDF — malware analysis report

Static analysis result for SHA-256 8363371e4631f09c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 02:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 264a589a9ded8df2ac43989719885843 SHA-1: 482b2faf878d098a78d804d7139f81d499b3af85 SHA-256: 8363371e4631f09ce77d5528cbd884de10ddce2d0dc4826c13a4811f7bd488b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware download sites. The numerous external URLs indicate a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=alcohol+related+birth+defects PDF link annotation
    • https://zebcom.in/userfiles/file/18800723118.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-26/20210526195241601142.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848c52a0b21---26450601374.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/99513469915.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/97514606577.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xijexawasenexevifadu.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/safogafaf.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8191b28559---21150117235.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/ruxekug.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/kokoliva.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16121664fac89f---11365835832.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0ffc108a570858bd93b57c99a421b161/63197210824.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/37384789389.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/92163063256.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d50e47924---dulunasofalusipini.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/gakifufozuxexitawukom.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/88546757299.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/16081436402.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/17758327550.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/71038025147.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/bagunozifitewo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3ba57d8922d582950d806dfd1ee1d8a2/pejegozupedegujugu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ae5332e3---bejudafakezorigaku.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d33ddabe5---zoragirasi.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/molodumojakelateligomedif.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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 17436 bytes
SHA-256: cd866c441b2b64afe98f73fa4b84594a12998e25be59d69638a4ac6ab7da318a
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 10592 bytes
SHA-256: 524274237263426f882d55feb4c6a5d8706f794fde18a9c2f889fafbe1feb5d4

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