Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffb3a8c6063ccf9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 12:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: af4ccc8db471b5a485048d16ccca4116 SHA-1: 49ea2faca6102114d5b63ca9d60a784169f941af SHA-256: 9ffb3a8c6063ccf981a79eacf707f333a718ef6c690c7e47a36d5fd3848ccec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file 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, with many URLs pointing to compromised CMS upload directories. These links likely serve as lures to trick users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5987a7f6---fuwomolekodediposuvemasa.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/81779449cd0ac895a2b7db2d652a244c/gunawegoribupisamokivo.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c483dac713---97714773525.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/sikutejajigux.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2vm2t0oh6kh903rei2vbslplkd/50778333916.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/18633847429.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/veboxuwekarigubefo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabd6706c5---50431867291.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/fozeduwazasajut.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/xijodarojigunaripakuzal.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/tijisizu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350cf069901---84442210237.pdfIn PDF document text
    • http://millecolori.it/images/file/rubajevodamubejawo.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/51564811984.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-13/20210913193148233808.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/28722726855.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/fasekuduxizumujerewifole.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/27007933939.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2235aa2c513b3057e050d3970046994f/mugukiburezobasovuden.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/segexisijesatiwobizerozo.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/lepebovofaxopaxofisewawid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=vivavideo+pro+apk+download+for+pcPDF 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_off0000b7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BD 18516 bytes
SHA-256: bd6700e3768b856a127a3ee5da642abc7d5164daef4cd9d213996a03ff7651c7
font_01_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 10560 bytes
SHA-256: b7d017e89e3f31b6b7ffd1b7ba274cdf217d12526d80d2625906c1def1c20bed