Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf639a872ecca8d…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 04:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 180ec113290fcbf87a5effc13327266c SHA-1: aa81db69bd397c99c479b9305f6a0a72bba14750 SHA-256: faf639a872ecca8d8422c7edfb7e2a55f8851509feb82d788e04e590fac84129
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of JavaScript suggests it may be used to download or redirect to a second-stage payload.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://biosystech.com/pdsFck/file/7332100371.pdf In PDF document text
    • https://mtydizayn.com/userfiles/file/kekukegazobixof.pdfIn PDF document text
    • http://xhzhengli.com/upload/35450934177.pdfIn PDF document text
    • http://househouse.it/userfiles/files/90571991863.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/78934060643.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cd2e0b98b---wifogara.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/ruxupitowagosoletat.pdfIn PDF document text
    • http://handgun.ee/media/file/ziboduwisek.pdfIn PDF document text
    • http://midel.me/userfiles/file/nutobomoburorimi.pdfIn PDF document text
    • http://4yoga.by/pics/files/xizedefulemadovi.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/neponijukosifova.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/nupopevonajotifudo.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/kurabatedetolepixudirus.pdfIn PDF document text
    • https://mihalex.by/files/files/34697662022.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/vixemudezerutowoxovebasid.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/16833473155.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/66437906326.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e0u64mk6o8kj5p88u4nl606324/17333284293.pdfIn PDF document text
    • http://chikatere.com/Upload/files/70384880904.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81a5c889236190e0a0273150a0394692/bukifubiredegotekizebeves.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/78599362652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+football+game+apkPDF 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_off0000ae97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE97 10688 bytes
SHA-256: ab4eceec06bf5f43b7cfc890acba62e159f40f6d940fc42abf8f6d90f379a2f9
font_01_sfnt_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 15064 bytes
SHA-256: 6987eb439fa243cafbe9634e182ea0a8b0db17a10548e0a32b6660d746d4d72f