Malicious PDF — malware analysis report

Static analysis result for SHA-256 764a7d87da5f3322…

MALICIOUS

PDF

91.6 KB Created: 2021-06-28 03:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 523c2b34d4644a12c33866f87bfa70b1 SHA-1: 4244c12d6696cf333f5491802e5fc95c06a0f19f SHA-256: 764a7d87da5f33223bd0df614f1341915434ca12e5aef97cfc293c0275f449df
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=newton%27s+first+law+of+motion+application+in+daily+life PDF link annotation
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/83f5808465711e7557bbe48ba7b52214/52603352493.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ee813ed9---kasadosatevatuzirux.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bb852cde87c---wobijokaxefikuxiweduwi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a2af9af9d5e0e608f8b8476d836828c2/54591836216.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/6ab61e035d3e98908622871374b2746d/91539552841.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/723164c18a7cc16b5c2eb305c7a22344/10166562655.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00b71b7322---sadaxi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/94981101263.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d2d6ff07ce74445beb2067b02617af06/1459860580.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6fdcc43ebcca976522775d818eed91c4/18131496159.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/50165487637.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/38e5e80f31555f8f52e059396a3fae3b/pejubixalowovem.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/c77512529ca982cfe9733996716a9dd6/29949825195.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/57751944293.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/rutunesa.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/82783700826.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70487ad080---44717659582.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c52db456723---67374723740.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607252df2783a---79020561377.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/508fac16966b2b574000a1c496c1aec7/vovivexifug.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210513063644297410thb45g.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/94736560116.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd38e1bcf---28225164816.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160776709a4c47---62081561559.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_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10992 bytes
SHA-256: c92df209577e119bd1e81e945b2635e1c5f17309841bfef479f6e5af9850c4e7
font_01_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 18084 bytes
SHA-256: 4256bf8aeb610c7ff69c43bd5c1006eb230399f6a2f4f77873a3e20cecbee828
font_02_sfnt_off000149b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1