Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b3c7f9f5135bfd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 00:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 883d1a89b2f27c12a3e3b399a0beef0e SHA-1: 7523f9849aacfe5f70f3ff4f63e72a6ba1413ed3 SHA-256: 91b3c7f9f5135bfd4ee936030b6ef09306d66757ec17b985142f618dc0ea0ae5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links likely serve as a link farm to redirect users to malicious content or further malware downloads. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to facilitate malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://teplo76.ru/uploads/file/rubisidubesijodi.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8289ca0c---43919095419.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/nasal.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/zotegilawavirenigixun.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rojilirar.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137573ea4217---33040827762.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/71631924504.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/pijowefawowumi.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/masisoke.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50527aac1---kakofuja.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a864a9150e---xonivawotik.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/bekuwuzazibavegukojikexew.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/25930071809.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/gafudotozavew.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/salamipasijibemo.pdfIn PDF document text
    • https://ckmandarin.com/uploads/82754290603.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b71ab0c78---75950251282.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/15481319352.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/tilepikikajatulabi.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/61001696138.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909202548360329.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/xavovuxikunaw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d23b6d998---samusiwuxokibonixidiw.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/73871767964.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixorazilorulimenivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=forza+horizon+4+verification+obb+file+downloadPDF 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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 10812 bytes
SHA-256: 1a2c4709986335942d3bfc6a3c5829eedf451e343cca9f3ddf754ce01fa0a699
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 17532 bytes
SHA-256: 0aa0de0f04aa16d3ad94a52d2ee5848dd94a2dcd5715a509c718443cf9d6788c

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