Malicious PDF — malware analysis report

Static analysis result for SHA-256 df65521df54af406…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 21:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6f8a06a3f9c3aecd784db2ae30ff8f4 SHA-1: a9e567187d974ced1bfbdccc7e967b2192557e52 SHA-256: df65521df54af406c9557d516a0e4faaed5b5332f4135a1f856201826e29850c
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ogu880ml2eddlqtg5mo81al466/pifevulebikimafubomet.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088f8a0ec3c7---71975663428.pdfIn PDF document text
    • https://xistenze.com/files/files/vigarutekofazapusuxep.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/wujasizonuw.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160835a4c61fe9---xifilunerulig.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/kovowa.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/37329008240.pdfIn PDF document text
    • http://technocom.pl/editor/file/vusivenowixabefupasuz.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/woxedubaf.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/61280633189.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8436d067c03f6083373dd272f7237620/11164366951.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb9f4d457---87241970000.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7844be628---932693156.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/betodov.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210627075030.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b6c6085336db519d0d6a99f79002c2bc/93575704248.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d36be3760b613e6a91e90c99d51784d9/gogixijikivumerukanesiz.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2f86166f55b03e27b3464de7e434719e/dozokelufuxorigadaj.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/51746074826.pdfIn PDF document text
    • http://school15-tyumen.ru/f/loxasumawituxuximirosuzis.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7697abcc1e---53833957903.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d4d5d1224---xefar.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vt16k6lgj2ira1kk0bhtvojcpo/37335619957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rapid+keto+cleanse+optiblendPDF 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_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10684 bytes
SHA-256: 1ac1de2183d0be49c5a9333a6d6bd0f6b0ff6d11badd7375003c56ae4cf62f8e
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 17060 bytes
SHA-256: 69272ccbf835ca52aeac08ee83fd4710ef3a129d3c76c41f07e796ff513cd2b5

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