Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6bc1ffcf3682a0…

MALICIOUS

PDF

82.9 KB Created: 2021-08-26 05:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c31564de2749f5577d6d86d81d3bdab6 SHA-1: 71d6ceb3a92539f533e7c8cfca958eea17d8c187 SHA-256: ab6bc1ffcf3682a0dfe7c4c2565d8b98e89d9c946c636b3aed581fa88c3b8df6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://finalstage.biz/js/upload/files/92202436186.pdf In PDF document text
    • https://network-italia.com/file/dijeranegexarijovuvir.pdfIn PDF document text
    • http://webbuilders.com/files/file/71528951797.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/39066398704.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/3d9vjf9126aajdb8cgbrvr03ft/75952693247.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210625_0718DD20EA3D6F69.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ceafe5fd4---lisiwube.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa816cc65dc---66643856.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/4cf1uu201ou0uhsu7v6f8ukjdm/35437587680.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abccd6b2eaf---27581426030.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/birexeko.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tirawuxija.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9068c2e3ed2445a9982fd0bd76d8e50e/13184566987.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/80868592037.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/91099714221.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/39417754304.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/79463561490.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4354856d44ff1b5e9d839dd50c0be31e/69135850936.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/ladebebivinakef.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607498a529880---watomubejijurafelutolexi.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/69474659709.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lisunikapanobet.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/40284131364.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ac1e32f02483b35b130e3e9c495c4fd0/62524815215.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/39953904265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quotes+from+to+kill+a+mockingbird+chapter+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_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 17032 bytes
SHA-256: 54a42884685df95c77505361c6dc7e0f6c7ba1606d85c99251cf728f9af9949e
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 11508 bytes
SHA-256: cefd4183fe819a919fc121cf40f91a51be68dac1ffeb7f7ce6f4be68adb89a8c