Malicious PDF — malware analysis report

Static analysis result for SHA-256 6727188ff6cfd3df…

MALICIOUS

PDF

119.5 KB Created: 2021-08-19 11:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4bea19b9e438e237444785dcaa2f1f20 SHA-1: 3501034a3cd0eedc6581df761ba6df8c67db5224 SHA-256: 6727188ff6cfd3dfba55b58ab408f118180da53d2ae3a8ebddb50b29f596fe4c
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. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hanyauntuktesting.com/contents//files/wafavupemifefelajilitig.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a326b124f4c---jurago.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/famogodokavogud.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/misemimesoliruwokirag.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/texekejatuv.pdfIn PDF document text
    • http://hms31.ru/img/file/70441347575.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c23d303a0---nilogemi.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/50228356048.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/20129473656.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/34741735935.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/28076147085.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec3528869---noboketigilevejara.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc94f1383db---noxafefepigavumulipedatur.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddbe9ddb4c---jonesizunebutal.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sovixim.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/36847684914.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/30bf83b309f99fecd587953043e120bb/9431059926.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/roxadalojizovojosowemil.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c000f83e---89830409730.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/52611187169.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e06f1df989---29362143344.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/7322627909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=euro+truck+simulator+2+t%C3%BCrkiye+haritas%C4%B1+indir+1.35.1.31PDF 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_off0001674d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5F 20436 bytes
SHA-256: c31515005db4b43668277c6a3238d21c268714e88ba4666035f5f1c0ca81ef05
font_02_sfnt_off0001b1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1E8 11708 bytes
SHA-256: 41dad7d931639e57ff4ed04b7f72ea13412bc1a1e181a5f4fb334ab2a1b38628

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