Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8b273a337e7ae2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 03:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 835b0054afb4e5a0d0c922d8e9790c72 SHA-1: 99723fca908abe609553edff7a901e331443fdf4 SHA-256: 0f8b273a337e7ae287a49c8636cef2ca222c8fe96add2df0c192abd993c0b5a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs, including links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=avatar+the+last+airbender+full+series+online PDF link annotation
    • http://jcon-aps.dk/userfiles/file/80107085773.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/93168438147.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e530033ec---wefumimadafok.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/1268962477.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/99352427646.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/32860087125.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b98c7e048---jivosuxapisuwupilafubo.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907020014.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/66303251167.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9fef8b6cd5e0c4bb86199d70e34bcfce/203587653.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/xokuvoxobogajogikakofu.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/lezifiwuxubodasugonetupa.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bilapobapedefij.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xutofedizaxulavusurodeb.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/gurusixekanoj.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/21067061030.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/12712369248.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/depojuvesilepawig.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/74940124502.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16139f80a20aa7---8545686532.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90b0e3faa882fa82da28eeda1892acc5/bapipabutulimorowusomemaj.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/niroximipurusejopab.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/tevadonotub.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/19654891759.pdfIn PDF document text
    • http://ellev.fr/upload/files/sifegiguxexivuferepe.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffee3951c---46253603707.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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 17432 bytes
SHA-256: 5bc15a1eaee3725804997ed3b235bc15b3f5c95420f347e6f3f1a2ac8a403ebb
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 10740 bytes
SHA-256: 4e90516f7598af46628f83d109ead11ded7a967d592c0a87c588f8caa563f3ce
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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