Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cbcbd5d637f780…

MALICIOUS

PDF

88.9 KB Created: 2021-09-07 05:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 738fbe605780a0cd8f325d76109822f6 SHA-1: b3dc8ade57f628e4960ff063d1cfe2c3b242d4d7 SHA-256: 89cbcbd5d637f780635df03b996d9205b41927ee68b80069d07eca4ee16f78c3
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the document as a collection of links, likely intended to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://clubelsendero.com/img_pag/file/fejevuxuniju.pdf In PDF document text
    • http://debeight.net/UserFiles/File/10352208075.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/kuverusize.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/jarijemigobedezenuxiker.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/31562449973.pdfIn PDF document text
    • http://ledson.ru/upload_picture/76208625892.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/4tl1bq7r0bglcbjt5bkgrv01rg/turubepexizivu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4a3cdd914699b3731f71641d6ca1902e/59266839727.pdfIn PDF document text
    • https://olterus.org/contents//files/xositotadob.pdfIn PDF document text
    • https://ever-progress.com/upload/files/39480672228.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/77224843890.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a4e572695db6538d182f333eb90a38a4/zaxixugepugalinewar.pdfIn PDF document text
    • http://merwepizza.com/upload/file/15267234441.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b626570d2ca---vakotomulavu.pdfPDF link annotation
    • http://heyumpnd.com/userfiles/file///mazune.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ik0du68g9blqgfd9r7g4lganpe/13485304034.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed28aee52---tegumamatoxati.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160773abee0bad---87197614771.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/sadaxilixer.pdfIn PDF document text
    • https://aedwea.com/upload/foto/76909131122.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094de8a06caf---11770345095.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/11757886353.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/bavebixafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=huawei+tablet+instruction+manualPDF 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_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 10708 bytes
SHA-256: 10ff9b424704009373054020722f803f81570408530d44d8ace6709c1f9337d4
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 20180 bytes
SHA-256: 426ca8c65356467b0400e3996c43de9c51e8f840165bfd2ad043d752f4984f1e
font_02_sfnt_off00013c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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