Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9d24c36fcebeaf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 04:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1f1f28485d83d9eb5e4da7c0cf6d6b0 SHA-1: 57740306fc001d054d59068145bf37859f002854 SHA-256: 9b9d24c36fcebeaf70455bd7b95ce0e4a3bd44ea796fd9478a997c86ba91b122
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF's nature as a link farm implies an intent to redirect users to malicious sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://partnermind.cz/images/files/52460786786.pdf In PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/26509444222.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/46542dbf2b1608ffe84dcda9443cf20a/tinenigutisujazedisu.pdfIn PDF document text
    • https://artbynela.com/uploads/file/wejiravozalose.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d99eb17ec---63897540329.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/jotesusonokodubis.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33337382996.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b2fd64de---xanumiliga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5aa5598c---jovewogudolegi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3de79933dd812c19e2e031f211074412/kivurozekepixiti.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16127313f8bb1d---93606104912.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/daxotamosudufut.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8230af50---1839784476.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/48759367656.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/devuvubuxelupuju.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91c4d8a280---sozumonagesizeji.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/51630762998.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/xibesakafegetadipofilubax.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7d32e2de6e141282bd11e754f60b08fe/18133411243.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/52eaaebb8994246b579508e4638df610/zofukokigevulukokar.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079272d23f3a---tobabogugomodugadofoxewol.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xisejejisenitolokipemi.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/71798959365.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8dceca8e327f5a8937c0403aaebbaaab/90514589557.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/7305457910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pdf+voice+reader+app+for+iphonePDF 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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 17632 bytes
SHA-256: 859ea79a301243155d17650cb4da0bd59eada783990031e9a0f363b59ceb2da1
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10472 bytes
SHA-256: 16f4ac54dbe44f59f78081958f71dd5d20a32d53322bb946af54b41bb2d9dfc5
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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