Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5d04854824dd01…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 11:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3133676f98af0a76ad6953c4d6b494d5 SHA-1: 7eb4bf8f7ed380cd5cf8a4d0815bb9870083b653 SHA-256: 2e5d04854824dd0192e3fada8ecff4ee6d97d9e500eb88f3b203759d5984e74d
156 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the presence of 'utm_term=android+1+apk' suggests a lure for potentially malicious Android applications. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

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://queure.ru/uplcv?utm_term=android+1+apk PDF link annotation
    • https://yennenga.org/business_school/uploads/file/lerimozexo.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/50491746285.pdfIn PDF document text
    • http://geotersrl.it/file/92266921800.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zafenaserug.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365ddf3c06f---lasatevada.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/50154319006.pdfIn PDF document text
    • http://proxima-online.it/public/file/68937920193.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/nutinirasimewoso.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b18f2c62cfaa71280bf02f5423005e8b/43545882890.pdfIn PDF document text
    • http://hanauhrova.cz/files/51154197788.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/pigasekoduzoziligisati.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/xupinisowegomubuso.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/pelarirapatefewutasebol.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/sugozuj.pdfIn PDF document text
    • http://nprofit.hk/userfiles/85374422141.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/jupudabafus.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045e3f15d3---xozugaxafeporatifiz.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/82327591722.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/roduzatarumago.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/16/zikusejadesix.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/86340210944.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/43051301516.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/kotozedupipalowose.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/wigukizakeravokiloleziv.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/nekewelojoxejivox.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_off0000cc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3D 10068 bytes
SHA-256: 1b4638190a4bf3e4cc6c9f36328fe367e29762e6ee209ade77c6e3df7a317e52
font_01_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 19580 bytes
SHA-256: 724510e28d18823e8b25e12872949912db83c47bd7f1c398b969af58705dd9fb

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