Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e146088e64e916…

MALICIOUS

PDF

90.6 KB Created: 2021-08-03 22:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a7465a1e8480375cb1114526e26b8f8f SHA-1: 053ed85aec9620b9dacf9388f9da331ff003e1cb SHA-256: 34e146088e64e9166ac46049abe202af41513aea1fc60ad993f81a3444a2142a
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 0.9986

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://almoheetmanpower.com/public_html/userfiles/file/numinenojalegam.pdf In PDF document text
    • http://gidaero.com/upload/fckeditor/file/16571291159.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/794a6200553f2d2546bd1f00c4aa03da/fakadulovugivigom.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/duwozapi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tt4t22h9ud34fmhqm6vt7ekodo/30700757672.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f149f5e85c5f922e8e8733b53bed96d6/nizajisenagelito.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096347437bd2---29728241458.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/kewizagevogudopeletok.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d54637091---715410786.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/nuzulubi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb933b557d---jedegugeribufuti.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/jubifud.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/nivogevigogiser.pdfIn PDF document text
    • http://canvangdientu.com/images/file/22367446573.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ce94346e---goboli.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/gibigavazowezemubidutise.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0a60e4f11956d74561488f781e3ccffc/duravunokifiwifedogak.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/11408017183.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/ropemiroropire.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/redekufivedatabuzesetopet.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ffa2ddf8aa2983cbd0894f544b0f8107/86167008524.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8945af32---biwenelovafa.pdfIn PDF document text
    • http://bscartridge.com/pic/gibafedaxeseluna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=auto+service+manuals+freePDF 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_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10644 bytes
SHA-256: 32ac50d80395a7384a4169f4d089a7026812e88fb5c0e4c5345e80ff3b679af1
font_01_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 16988 bytes
SHA-256: 67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b
font_02_sfnt_off00014412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1