Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f78d2c7944afbbc…

MALICIOUS

PDF

87.0 KB Created: 2021-07-08 12:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 532febe3f5552162df49b6e103d5a96d SHA-1: f2d4e047fd8ec3601b179b83c6424d528f627033 SHA-256: 5f78d2c7944afbbc3afd98320eb6582ef263efd087cc1e84dd857cb957ccd631
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=hysterics+meaning+in+malayalam PDF link annotation
    • https://healthmatters.me/userfiles/file/79311175075.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/53053562914.pdfIn PDF document text
    • http://c-six.it/userfiles/files/51476982440.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/95046742961.pdfIn PDF document text
    • https://ghnservizi.com/file/52380454552.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/lafavureg.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/verezibawerilutamev.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7e1e4517bde718ebe1d5c04340df87fc/xupivonokujamakon.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11409ea208---malupuribatajezuwi.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zalenexeneremefosag.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0fc7050fb3ca7125b698362a6632f147/fejume.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15212164821.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/71793648060.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058eacad99---wimoxasinepedebolu.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/fisav.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/721165a5bf73895baad946bf2c809623/vovitematinanudanifup.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68fdea6bf---79956712349.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/30ed2e28c607412696cec2c768ad2e9a/66369872309.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3900346d830b1e2309a3d805d5ebd882/12797194926.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gubemum.pdfIn PDF document text
    • http://sun-tes.ru/files/file/pisik.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d304d5158b---wiludaxamukamapuwodim.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/1aa2126132850edcf206451a70b50c34/40886222299.pdfIn PDF document text
    • https://4appsoftware.it/file/3622415294.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609076fee5fec---jixelelaziboduropowutip.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5a66c4d845353a64c1c388691ea28250/xovamuziwabisuwejabug.pdfIn PDF document text
    • 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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10556 bytes
SHA-256: 984e855e690ccee38beee43e782fdbc5dfaf1bf8f2f1c7ac2b4947f939e0b696
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 17320 bytes
SHA-256: 9ad1f9ed1fe5d3fa1686cb9cd3ef77b6118db0f640709792075a2c78068905f6