Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebd432cdf495443…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 06:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41c3a4adb95305d67e1de444b0cd9407 SHA-1: 877b94cc129915987e5b22cf6f105565d3def894 SHA-256: 7ebd432cdf495443151a128b36cf95c95529abaaf5fca118fe4ac5b2bd7855e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external sites, which could be for phishing, malware downloads, or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kondicionery-vidnoe.ru/upload_picture/file/bugikures.pdf In PDF document text
    • http://anapro.com/ckfinder/userfiles/files/xuzefegasagazenajojugew.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139199245f2c---vonurixibazudegofomegiw.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/23b665146cf33aeeddb8e3f0aa593356/16677513838.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/29293997087.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3d4005ae---11549104040.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/muzuteses.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/lewibu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f850d2a45de233bb517bd5d4f09d1579/17343442578.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/jodomilorowoduma.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/dexavabub.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/15310187131.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2860ab0d0f5bbe7f52dd55f874038b3f/56073064108.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xasisojulobaxukubenovaw.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/finobukodivaronotifad.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210912090138.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/ramulukotu.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/xukajibeguretevin.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/81960072549.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/24633219808.pdfIn PDF document text
    • https://nexapos.com/upload/files/55200675040.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210916040755_1058804308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=machine+learning+using+python+pdfPDF 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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 11108 bytes
SHA-256: 1a56fbf090464125896ad1c4ab61e96da6857617610a2873130ee905994bc796
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 17076 bytes
SHA-256: c2037b4660ec43e7922c771a0dcc65c0b17676adf91ed1a5ab74014d00893ed3

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