Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b63b37bbfd29904…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 20:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c43c1f7253988c15019e806ae695968 SHA-1: 34fad23da9e7bbdea13ba3f2a63212e707f4c516 SHA-256: 5b63b37bbfd299049db17d8906d06981ad54cfd52ff0f1ad0ec1f461bd9ac9d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and heuristics indicate it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a business-email-compromise pattern, aiming to trick users with fake payment or bank detail change instructions. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://fantasymusic.it/userfiles/files/roleso.pdf In PDF document text
    • https://rowadalbyt.com/userfiles/files/32744655553.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/37246101781.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/68021756303.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/76317308414.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/97568911595.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/46120323287.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/39290576612.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///runejubelopegoripijamilug.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/4063434762.pdfIn PDF document text
    • https://stvorki.ru/files/file/47353690071.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9c261422---wirejolenazol.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6fbe6e87a---voboviwajakaxaponup.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m3kcvu525eouor46h3kg97kpf0/zezamogimezafizugeloxu.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/zozakeni.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/60336086128.pdfIn PDF document text
    • http://edallyshop.com/upload/files/70164957532.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b03a51ae42b1ba4d34ab59f4e2853c19/4534584981.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/40779957747.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/70797071760.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/sufabagajunokobani.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/nabeminelijogovebo.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/gomefutipomevamupukixa.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/xinukovixipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+share+android+calendarPDF 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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 17980 bytes
SHA-256: 76433b5bea361ecdd2b36100a54d663c5347ad7614ff8251f6cebcb1a91fbe57
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 10544 bytes
SHA-256: da077990cdf29acbc118b66cd3b0c4b6c6e8f63922a773a393717e5a5ea8a014

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