Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0789c3f4fc96dcf…

MALICIOUS

PDF

83.5 KB Created: 2021-06-10 21:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 95137c64ffbc338296c9ae5fbd84adc4 SHA-1: 3bd0bd5a5296460fe8c446bd045c3df17c9bae05 SHA-256: c0789c3f4fc96dcfc2b534338b46a88f3878f76b62ea02e4afbe08a4f97a8471
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 0.9998

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 https://garglob.ru/uplcv?utm_term=pubg+mobile+aimbot+download+apk+file+for+android+%2526+ios PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d302307c7a---fivuwep.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2774b881ce---fifemazorodexuwu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab17e1b416e---46710279067.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cea8aa6f---41380848747.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/62074604707.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/eaf0395e749d900154c9362f3ca9be51/zazufiwosizak.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/zolozutom.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/noxidowudizawenunov.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/fopusubapagazibaroxedux.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/relij.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a79ff3e9d2c7cb471a4ac24ca6e04219/makenojonuwurejejof.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b239ec8ef11---62107304166.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9ebe7c2dcfaf8004513cc75947e485cc/36558972056.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/29963773962.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4gg8ihjre0c6oonsdesn64fr03/41894341800.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fbb9c1fc7d1df935fa8a4e838779ad63/rarubegupofesuxota.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6b10e56da33ed9e3ee7ffe16fca65d81/99967110964.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fdd1153e---63577280684.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec4dac9c7---43695970188.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 5480 bytes
SHA-256: 981e406e44c0fe9000bcfe6c90e20cb660469328c778273abad3592da90c1186
font_01_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 3176 bytes
SHA-256: bac8f180376f75fae8198d0cf76b8b30f8da2a9f607806c15f5a1957cd97c34b
font_02_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 11184 bytes
SHA-256: a609cca4f6752404be3ec3358cf035f1b00aa3ad4a70a76c07b76a83e2bf78ce

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