Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95c9667783ac5fc…

MALICIOUS

PDF

91.8 KB Created: 2021-07-03 11:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e9b839ac55a49787c80d2b049d49128 SHA-1: 1ed2e12ba041a3203ef14acd2fb652f223c6f1b5 SHA-256: f95c9667783ac5fc90efa7b25ec0174d43da9869730640065a13a776cdc3b182
156 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 phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and link farms points towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608962a87de7a---tebakapaz.pdf In PDF document text
    • https://pt2-turbo-j3t.com/contents//files/lujebarusefak.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/guwerovagiset.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e206e6a45---bupumep.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2aaf787ceb5f89cd2c4b6a872aa9cca/buvoxazu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/75576807446.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/65115636129.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081544944026---92892124463.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abbbd1ea52---liwafukoz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8978305bee---539939736.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mcfdsrq6vjf86v799hrh68sgp4/29872657446.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/kuvilan.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/vinotusob.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f171c4e39---vizufubigeripisibipifik.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d653e5046f2---juwifasekijidiludosiporar.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/52783491019.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d61db39bb---99477747013.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/70edc8ab7009be2a463f34199363eb6e/77596290465.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607794453475c---59234157562.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b648d5e14---1951177270.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/282c8cafb3f0c2b1ebefffb195d69093/14403786906.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/52a1108ef3015b91a8e434d8fb38c2ef/394422953.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/87153106789.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/sedidikalumosu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d782256203---56070742486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=11th+college+admission+formPDF 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_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 17348 bytes
SHA-256: 4ab4dc6780e531ab37e6a87732d263ec383066bc7f08c5d32dbb720f84893db5
font_01_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E1 10880 bytes
SHA-256: dd87f31e28104f8f8506c20f7ae88d6ba714a5623b56c940e4b80f4cda9ac05e