Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e10f6162c159c8f…

MALICIOUS

PDF

90.5 KB Created: 2021-09-01 15:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20588e27314062686e192e86a649ec82 SHA-1: 70d0481549643927b4728ba9b97d41e2aa666aa2 SHA-256: 3e10f6162c159c8f2a025446418edfdf1523b7382b260a62f8c16e78b8147e02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to phish for information or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://anitacalderon.com/ckfinder/userfiles/files/mivanuwesinu.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e05ee3982---saxedukev.pdfIn PDF document text
    • http://rjt1.org/upload/files/vubez.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/59003002794.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/61782095837.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/fepafaxobajof.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a913483e51e---wunubelifipogedafubenudib.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606d97ef832e1---tokerel.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/89271653036.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/52803010591.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/82qvt6ee1j3olboce4n95he0e1/83309639093.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/174a077b1d41e99f5fb49e20cf6d24a4/91994858763.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/xevewaperimuxotovixolifaj.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/juwupuwuxofikexasura.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3f519d58a1359b5375a4475236695dc3/31674709723.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/faneb.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d617afba8---rerogojakevilotiturelo.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/4142119073.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/ruwafolubavosevasolane.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9d3be6bb6---walovufimubavasugaxijad.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/80553201125.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/48938552377.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f30399d317---wawutaxozilawo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/77e714701e68ece2e6d8ec18d3a4e384/binemuzuvefepa.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210707_A00559F491FD2481.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/46917994565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+world+of+stainboyPDF 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_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 19056 bytes
SHA-256: ca3756cf1fa28fea5e738d56eb5860e4f1a6da1dd7002157214b7e569e499df4
font_01_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 10756 bytes
SHA-256: 91590d1ab0cda2ec263742e6f7452ca6d3b04d82703a3fe1ac51b53b416aae1b
font_02_sfnt_off00014305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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