Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a90a6d163c4030a…

MALICIOUS

PDF

99.6 KB Created: 2021-08-04 22:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16485b78ff2651c6eec190e6edb53293 SHA-1: 1a8b1d049207bcc5459a613af2b031bc93edbf7a SHA-256: 0a90a6d163c4030a716678c331d73094e5dc17ff72c45268d1f902feb2654a75
156 Risk Score

Malware Insights

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

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, with numerous URLs pointing to websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://irlanc.ru/uplcv?utm_term=how+to+write+verification+letter+of+employment PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856dc498c5d---wadivizaf.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105139d0a1---gaxotipimiko.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ec910c5e86a44336358b039e4a0bf5f6/22997928999.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075387c092c1---96713978944.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/jepadanap.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/15f3ee65d28637dc5de8b2e3f75b9abf/dajulexa.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3fcpp3llacj9debdh30gmjs6ag/xirezalovotiguj.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jokizilikepetijuwubigavas.pdfIn PDF document text
    • https://peterdegendt.be/file/govudeso.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/mizogodiviraguma.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160745489597ce---67896824262.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160715740bd7df---92959113177.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/71834583317.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8eaef5883430a13c385f2fcd15f785c9/tusutipuvibabuwi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lugvghdr0ve2epct99g72c06v3/xotojawi.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/81067893149.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/1843514882.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c6199a42---loxilujovomitabo.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/36972836126.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9db43cb4---36718950382.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8d31e262aeab563d0d698fafb469a061/lebofozutodakujevoripad.pdfIn PDF document text
    • https://tisuputih.com/contents//files/komebelodexa.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/64454636953.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9496a7ff1---zesaw.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/87173158516.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_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13217 19696 bytes
SHA-256: 0f4cc253d744b171e03658deb7ecbf75cde407c201a85c84ec0f9bde664ac943
font_02_sfnt_off0001655a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655A 10732 bytes
SHA-256: f3f084869773f58cf0ecc627867331a5477a958cd12ee73b5e2a165e400aa2bc

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