Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bd29fce3dd2e3b…

MALICIOUS

PDF

122.1 KB Created: 2021-06-09 21:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2d8bcf0ec406157de2acc7f59d936a0c SHA-1: 3bf26476cacbf4a601aae762df02a6f1ba7444fc SHA-256: b9bd29fce3dd2e3b0fe22de4e9c05413aaa305dbe39eedb56b1b7ffaedf0142d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=gameloop+old+version PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96573314c---45756263388.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6b0654ahkq0le1gjlh1c9l3mu0/rosufafolefemewupod.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/risofizimusibire.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b544652207e---kopofubanafawu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7edcb3984c13acb493729a2ad5847a30/tusefonokixekifunafelikux.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/riwewukufa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca67e510cd---giwitipifad.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7af44d27---minapugunidevolitopexado.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01ca1a2b4---9701332497.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9de50d3b0---wupedebuwebikorurow.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/boxowalozupu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/c6ee718a8e62962aba8e9664bdbc9448/wazoxerobodozeke.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/19344118938.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/nf5b1go34e3scfkuo8fqsclanq/63806631286.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/70f77e506a20fe80d0fe8bce3d9fbd4f/zokegibuw.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabf28957d---tofugebategaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001afd4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AFD4 24704 bytes
SHA-256: 41d3452791101a7cab604a19db96680d1370743067fd672df458189f6fffd6df
font_00_sfnt_off0001627d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627D 4564 bytes
SHA-256: 1df230e0a1fb08bee916193f7f5a2d4992b18441c9939e5ce4a65b6fc2a9dbbf
font_01_sfnt_off00017255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17255 5196 bytes
SHA-256: 8210e21cd4fbee2b19dc5595f55f80ec0d3a326932be195a9bfd06958e3aa503
font_02_sfnt_off000183f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F3 13572 bytes
SHA-256: af4522d6f6ac4e402078d61169d6d5d3647ced09d34c13f1e962873bda17b499

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