Malicious PDF — malware analysis report

Static analysis result for SHA-256 947cb38eeb6a1f16…

MALICIOUS

PDF

77.4 KB Created: 2021-07-14 03:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ce75b4ae64c298e70c018352efb292b5 SHA-1: 28dbc3158395bf01660c8912cc3b724f7721d6a9 SHA-256: 947cb38eeb6a1f16699e72c97050bccb71cd57af7baa84ac036f530029371b3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. While no scripts were extracted, the presence of numerous links to potentially compromised domains suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609df21cd0c17---90487752213.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cs6eplbdieihfrv28j7isi5t75/jopilikomos.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//xegatudejudigoze.pdfIn PDF document text
    • https://mauspro.net/upload/files/14883188202.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/sidekevuwovesetex.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/d391d61edcd670c0e19c78051e594ebd/2078913507.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8466cb015626e32049703198060171aa/tifagetomutiseke.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/87626998587.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/kaxevibuvi.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/90140911331.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096916ebd479---36943302346.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/49396784815.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/bujuledepasajisotewug.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cd6mdjbipsulogll2jg3ocrb16/8518767996.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af6523cbec1---62109171611.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/tinawelalob.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/5664551445.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/66913713371.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/n99sk0s44ur3pgu40llcs8qefr/27260541079.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a4vd2oc6sqa4a0lkre54566uq2/1918082984.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d020f190c9ee1d5ed4a78b535b07acb9/kevirutow.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0d3335a5bcf6c1be8a894574e1833b63/suxatonufiwasokidadop.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/18909418196.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3046879389---bodibaxokanibap.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/xezewudogapeluwasibobat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cuishe+cocina+mexicanaPDF 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_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 10484 bytes
SHA-256: 2343a3a9c86f0a45fcf43f915a9b92122e0e0f3cbd8855379ceb2324464d173e
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 17356 bytes
SHA-256: 8ae2a8134886b6d063799d17044dcb7db53b33a1aa5597251967633f1dae6a3c