Malicious PDF — malware analysis report

Static analysis result for SHA-256 157d8e1447c8bb23…

MALICIOUS

PDF

76.7 KB Created: 2021-07-23 19:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 484ad7d34f220ed46171a52fa868383f SHA-1: 418f7799cdcf24452157e64c92196d7c8e34655c SHA-256: 157d8e1447c8bb23c4e7cd3cee8fb27a20ddbde2a5ceba179769709407da22ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised websites hosting further malicious PDFs, likely as part of a phishing or malware distribution campaign. The presence of numerous external URIs and the use of compromised CMS uploads suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • 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 http://sung1.com/upload/files/didozavafevaxabe.pdf In PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/69443825920.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7fe35f2b965f6a59b5a954298a1fed99/92813562969.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/545de9348e46d8ee2ce4dabf47af36b6/4195920519.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a49cdadd---kuborumugeturozikogadolar.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dugatokebozurusi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d75d9f48f77---tijiginomobiporijeku.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5c83adae746ee2ea94c779736e5163c2/sawugubajuwijegem.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/12824792206.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b691280cb0---tinedaxipiwivomipux.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/divimufex.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d99763a3---29332551910.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/dce5505a3eacfa214cf7846d8dacd271/denulobudolenozasosil.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/61721182407.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce929277d7---susumiropi.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/98447957716.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/dafegepifubi.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/43429226528.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8414caf6---duwigifinogexol.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af72232c6b5---49472895474.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29edd995aa---matokibefad.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/35168491803.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da40ce7347---78407129078.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/53887438014.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e4e5109c---31806752306.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/xavubef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cambridge+igcse+ict+second+edition+pdf+free+downloadPDF 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_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 11220 bytes
SHA-256: 7b0c727647c864b189ec3669e52e77c9fb9bbde9972e528dca12472865d89b3e
font_01_sfnt_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16432 bytes
SHA-256: ab4c8bf2b832911cbae1b0e953d71b1e3b1a6cd7337341a0b3913f63e491e9b4
font_02_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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