Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf04f1f2123d99e…

MALICIOUS

PDF

126.8 KB Created: 2021-06-29 02:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4b7d4cfed7e0001875c152e36073829c SHA-1: 336be6e6f61ce013e92f6d06d98788c5aa0bd6b1 SHA-256: acf04f1f2123d99e88c13ea955c8245e8fe67446394575af38babbbf2b1294ed
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host or redirect to malicious content. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to distribute malicious files or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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 https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1059bd00218357587df77a965d7d7dd3/51370391093.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/wiwifemobifakejoguketore.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160730dd93632c---voraseligugapukopiga.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160871a63a59ec---14223857869.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/zimepaxojowebesabibisus.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6034b13df---79588703934.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b425524bb9---tisapetarixaletexujon.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6be2b8645---87195436616.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a366cc3c53a---dikalamavavudekafop.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8d2igkakqlb02u7g2k4hapq2bu/33323538637.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f926c33120---85719519628.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b78b7445---93483001440.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/leweremeworipe.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/negix.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/netunejol.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1qpr6hjh34e8ebbs7ustrilup7/33810729446.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/lemoruluwanakurunujakex.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a56af432---99280093429.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fu4a8bbr69j2dic7l6keigh4l4/rofare.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/74a4d87322b302dbafa753555df2f079/75798810658.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160987b1340812---33831157430.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d732c9312f4---zubozofidaxavevunixadi.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ec6tv49voe6daq4u6qpntvd2mp/76057493861.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/8423433069.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/57d2ef878c456fd4fc1f054794cb6d00/galimu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b7c2dd1a---xobukibipapusujafiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=obtain+an+expression+for+kinetic+energy+of+a+body+moving+uniformlyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A51 21624 bytes
SHA-256: 23cbd1dd505b30ad66bcdaca6c612e349b4df3533527f2c7ba884463a397f3b8
font_01_sfnt_off0001a3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3DD 16108 bytes
SHA-256: 9ea9197b6a75c7fe67a727ea228f5add925cef9a7182c4c37535d81b948c8910
font_02_sfnt_off0001b913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B913 11604 bytes
SHA-256: 5a6767f8867e85e888d24be928a7821746f16a54ea6c76df4f5ddb8a31db5d06
font_03_sfnt_off0001d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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