Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dcf06bca78a7de…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 03:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf052754313f0d25ba033a81b3d035d9 SHA-1: 5047ac0ae94e411f9476a8f42275aad877519f1f SHA-256: a2dcf06bca78a7dea89a40aefa8f1556e9c9f2b3e108bb19a72493d489f1242d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of numerous external URIs, many pointing to compromised WordPress uploads or disposable hosting, suggests a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic indicates the document's content likely attempts to trick users into clicking these links, possibly for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=wps+cloud+to+pdf+converter PDF link annotation
    • https://easresidence.ro/app/webroot/files/userfiles/files/kirevejitejevoxifovuvil.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/nuributuvuxarunidod.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tulalezewebuwunogikujajox.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/aec25e3ea2f5cd887eeff9c177dae2b3/pipibedojatupusumofanomaz.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/90637411258.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/nijesi.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/53043077398.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8a438d37fb96ccdea71ade502bae788a/19457577273.pdfIn PDF document text
    • https://robertbah.si/files/file/79912926358.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/95515005479.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6faee3797---1515720419.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e50b258fd5f---50178027611.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1bf6b3d1d1363f40996e9349d987ffee/verat.pdfIn PDF document text
    • https://cristalensi.com/public/File/11314658605.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/695cc92e319a37273111a1e567784955/91448061417.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dbiltbthafa7ttltlu5hf0kd8d/7591305017.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a2e2a97a3e38cc387372331ed379629e/viwopowumosipib.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/50305067010.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/21941746444.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9oukt03bpnqkesfdvj328nlas/60087490929.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9016357e07---xinapazexibuwezexumesava.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/0a7d918f62f6575f2f76a7c759bf7491/mufadipaxuwofizuriwidan.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/gavinojamadazoter.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/23433112556.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8bba6c7f3dd54dc40b622778f3a447a3/volivebuwarezexerefebo.pdfIn 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://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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10520 bytes
SHA-256: 09133984b68076036847f83738e7bfaa98708cfa9b8148264420b6dfcb3e36ff
font_02_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 17676 bytes
SHA-256: 522a994477abee03bec6902607d5e207fa1349bee50402848d79a88a8dd9f7eb

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