Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acd7d5627b9f008…

MALICIOUS

PDF

88.2 KB Created: 2021-08-24 19:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3fa8512bc9e46ef98c2d01110e4e48c SHA-1: 7ffb91cee6c27383e0bce097e61f0e4e802e01af SHA-256: 2acd7d5627b9f008baf36ae991c5a4e46833ab4d1b5c4814fbea6a3248633723
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The presence of multiple links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952963eee4e---9897008270.pdf In PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/fidipatosozefapopug.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xunuvugowiwumu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b982adc5530---51380616758.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0451fb3d3c---jufotululakekowenuni.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a059bd26882---luvumujisofokesoporot.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fc2be9a2fed4704218ff537ff5b2f1d3/jisisegilobomoxugutom.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1678aa617e---3106597702.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb29f5c274f---29071185765.pdfIn PDF document text
    • http://jcpingie.be/public/files/medavutoxaxeperusekik.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/dixusexotarulad.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/52968378147.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xuwujagalomovuvexa.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/wexodemuviliz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945e20a2743---51966396500.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c778164dd4---43483465745.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30fe288cc3---furalepamofifepofawavigu.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/899c9bd513e9ebdf089038db7e744802/fazivimevetijosorofa.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/rapuxupugidanojibimu.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/59099199195.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/bifodana.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070352346723.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/96b45caac52c0fea60d1e31edcee9c4f/posisubonosowaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=turkish+for+foreigners+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_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 17396 bytes
SHA-256: 9ae493db1d8b0dc361b1d1cfbb251167f2925b0f7e49cbd9a6427a5bb961ab5a
font_01_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 10628 bytes
SHA-256: 7a59d6c3eb0c4dbebdb9cd7b14a8e3520ff538747eba96d86706899b58f2679f
font_02_sfnt_off0001385c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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