Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d6e4ae43c7f52e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 20:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4908681940b984ea2ac05322f7207914 SHA-1: c3bfc18924c8a4f7feed7d7c20ec7cbfafbf4ffd SHA-256: 27d6e4ae43c7f52e8100a0fc9fa223a9cfaded6724a9f44e4bddf9b7dbf7c49d
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://0286869143.com/editor_images/files/zirazilulobogu.pdf In PDF document text
    • http://getsolarny.com/userfiles/file/87171889704.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/gakerazopikijotukoga.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/vukaso.pdfIn PDF document text
    • http://holzbau-napetschnig.at/31970677174.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b01d4596---74938881050.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/44037570882.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/68621620331.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/dakapojumulovon.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/fimediziniwogefunuxefil.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jatib.pdfIn PDF document text
    • https://derfo.info/resimler/files/warugijuremukekakutumeka.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd04e18b1c---86021306367.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3aa08ff715f430ef8664669acd4e1345/lixonuvi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v55fkm3rv7g50te8ff7aqbprl3/vusakibodibixasukileki.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2a20b6f1---nitinapapagolajawi.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/fojuxuzarofozatom.pdfIn PDF document text
    • http://e-district.org/userfiles/file/bukobip.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/28214281127.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/34366618629.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/15208249913.pdfIn PDF document text
    • https://5udua.com/contents/files/deruvanafima.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/xamed.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/74898659394.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/26396979981.pdfIn PDF document text
    • http://perksys.com/userfiles/file/didixaxitogalofalobetowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=windows+loader+win+7+ultimatePDF 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_off0000c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 10636 bytes
SHA-256: 308d3b7ae1dfa7b29533e196d4c9516a5b9583ee1ce198fc035a2bb2c50a608d
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 20156 bytes
SHA-256: 816cfbfbe21d6dd208640402578e31494b467e4f876a0c9140360f1d0c56d7eb

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