Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b7189644c51c5a…

MALICIOUS

PDF

84.5 KB Created: 2021-07-15 23:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c5b2e57edab62f566eadb4ec259e70d SHA-1: d88d0c77b38ee41f1a5276fc52f194a5a4a452c8 SHA-256: 78b7189644c51c5ab87aa37432b5f8a61e5ee0182e6911dc437cc3227a921ac2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host malicious content or facilitate phishing attacks. The presence of these compromised CMS upload links indicates a deliberate attempt to leverage vulnerable web infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/006f7c776c0baa4beb8026dfe482cc31/82669234966.pdf In PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/1df236d3a7c2df0a7a92473afcbc2d2e/5590622341.pdfIn PDF document text
    • http://ausafe.net/images/art/files/27325682712.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b897fa24517---vupoja.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sebigunuket.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838bc02fc62---zupiwiloneferunilarexen.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8181781b---36582062381.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e3fc0f0e6ff91b5d2d38e50ee51499e1/74529288428.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/16969199031.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/milnl562l8enp8kedg9j49kai0/gujugijor.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/10290811682.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/ff597463e3dd2c55064cac205990f924/vutimawipifapuxevopo.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/67795118796.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1c5ecee3---fobubu.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/gedizifid.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/jekuxorasomijokedawujeka.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/49926897344.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/a7478dc466710caa78fe10deb387d7c3/peraves.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/68325683709.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/tafuzagi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/i2akc3ri0erbfbs0q1bthsg1a6/zamegezanilukunojed.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/75325576661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+truth+behind+the+liesPDF 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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 17368 bytes
SHA-256: f77ea345df10cbc17e9a584f842788748f54a874a72136c973af10b473c0ac0b
font_01_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 10268 bytes
SHA-256: da34e1b00cf927af69091e24ca42fcc332196f9814c0ff7893fa250d450080a6
font_02_sfnt_off00012cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.