Malicious PDF — malware analysis report

Static analysis result for SHA-256 95324b0d00191f49…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 17:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc0c974fcc8d3b8775d81d56bee7e0e2 SHA-1: 49e72d92cc56eaf76d390a4dd37baed8ba10d171 SHA-256: 95324b0d00191f497dc61f851c76cc67bf582224b12f22fe9103415ab12c459a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aimic.com/userfiles/file/murefozibubedebuxi.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/459482f85bfdf04be55ec25a17054a19/xinalibopolutonezoposij.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2b0bb6f3---devemi.pdfIn PDF document text
    • https://tomas-music.com/contents//files/degedadobujufetajepelal.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c050f6b496---13102733469.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771408ef44b---gikigewatefosuxuke.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112f8bc8058a---42396825292.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7169d2efdb73d0b8f0feeadee66c55b7/54586944386.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7c6a8da4eb314e00e1c32df6e69e179e/22095761394.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/71589762083.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/22258216987.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/91331833738.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/24362557286.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0193b37ae3e2f93b29984995a10f6e5a/ruzuxe.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/26730326830.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/70283708407.pdfIn PDF document text
    • https://educhina.mn/editor/files/pifokamerijinesudi.pdfIn PDF document text
    • https://togeltop.net/contents//files/35231519738.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/wudizawizufeduwawuzezad.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/60363643316.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/gatakufut.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/39403870961.pdfIn PDF document text
    • http://yuli-china.ru/d/files/letijugezovosura.pdfIn PDF document text
    • http://chinazzjx.com/d/files/48427073591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+electric+car+ukPDF 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 16808 bytes
SHA-256: 964f17f2114864285f175b233ae9d6403c5aa4ad2383d28e5612587d103226f7
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 10120 bytes
SHA-256: baee35d64a2ed13f8d734c11a5e34eac88c1d70ea25f9e4a1f1a3df01fb1b1df

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