Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0b0882b2b97f03…

MALICIOUS

PDF

84.3 KB Created: 2021-08-15 18:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d1667a20e7fd1f7e75be964d9edebaae SHA-1: 08ed7d3c5fbf7907f1fd4d52efddd875272e482d SHA-256: 0a0b0882b2b97f032efb94db22537f136fe47be1fd181cbe07940283078d4603
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. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/48414766987.pdf In PDF document text
    • https://marmarases.com/upload/ckfinder/files/27414949742.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/18002512959.pdfIn PDF document text
    • https://best-label.com/upload/files/doranefuxanis.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ac33eec9a419f296bd1a7d84f69c8292/wodosebinafowog.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a0307lv17rb1otl6kh21fj9hk0/17413340506.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/25921404198.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b56f076dbe51ffa657151731a70078d0/67757568311.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/sunovinuwuze.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160853b274777f---mebevapavir.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/84829tjdvb1158ajuug3b9hpbn/lajebelamupidujebutuwoz.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/810ad76fae5e4f7a268ba974b87f1949/pasivoxeribu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/37777427548.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9c1a488---kezumubufakenapazo.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ceac6eb51---vapidumijotusab.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ef848du1f88tuk7igd3so2lj2h/vulogos.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/begevagumipeni.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/lujatuxodewobimob.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b421e094e9---91372145295.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/76181354846.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5fc0f4t6vlcf4p0pnkutmqf6p3/45847365928.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nabexifuwowebukede.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/76905003776.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/suwiparexijidupejejaga.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9c6b9a2c---3570741851.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e425e96f4---xiguvilasubopemeputiwizam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=upgrade+bios+msi+motherboardPDF 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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 17504 bytes
SHA-256: dd3da337f1b68a0c909261921cddfdeb38e39ccca8f7c4804dbab23edc3d4d8f
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 10836 bytes
SHA-256: f2e087a098aa433a985755e4083cda6d128777db7b3a978e44de0104e423143e
font_02_sfnt_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1