Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6b050080167c86…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 06:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97ccf9354bbe67c31cb582e5f0bd8510 SHA-1: bf5490f342c87beffc38422fc51f7c890efb39d4 SHA-256: bb6b050080167c86fcb10a37825422a853f10830a8b9335a0e5d77cdb9b63c87
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://konyaalotaksi.com/userfiles/file/kijigivetexufesozim.pdf In PDF document text
    • http://canadianrockies.info/files/file/98560238966.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/6552364626.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/75690966987.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/kozenabedugatebaru.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fec92d2c01796bb18578b9ecae6034d1/29407817110.pdfIn PDF document text
    • https://foulardfotografando.it/file/87512540161.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f274a15561---vusuwoxugetupodixaf.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/20094283231.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/newasoratomalewemebaridit.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/gefizovorag.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/96e4a6af4eef53639187b7751aa453be/sagenepotujazo.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202193121424444.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/bavasixefavor.pdfIn PDF document text
    • http://muszempilla.com/files/file/62518858981.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/12641877121.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/56707352130.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/zimezanepe.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/87951397577.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/86987089492.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/94224186944.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/pojijip.pdfIn PDF document text
    • http://hotstamping.pl/files/file/33343429709.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/42017781892.pdfIn PDF document text
    • http://vina2002.com/uploads/files/sodutomusasob.pdfIn PDF document text
    • http://szjg.hu/images/file/72859653425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bd+mobile+price+under+10000PDF 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_off0000bab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C8 10712 bytes
SHA-256: 8bda4b46406c0815bfddcdd142674d4fd6a06e006686884c70d14827a12e3962
font_02_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 17068 bytes
SHA-256: eaf346178e167630c7dfbead2c3b111e328ead688c2dda13331aeb14e25eb1cd

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