Malicious PDF — malware analysis report

Static analysis result for SHA-256 68299c600c1a4232…

MALICIOUS

PDF

80.8 KB Created: 2021-08-15 00:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74ba534b9e260e16f3c8a65971c7f142 SHA-1: 98d8b2d724ae74400937c49b3d309105e91fed3e SHA-256: 68299c600c1a423289ddeb0d066a9b4400cc480924acb252612e82a356e4b977
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and heuristics strongly indicate maliciousness, identifying the PDF as a link farm. Multiple URLs point to compromised WordPress sites or disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=how+long+do+you+cook+pork+on+a+george+foreman+grill PDF link annotation
    • http://yao-cheng.com/uploadfiles/20210630092149.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/333d64ea83c2f3aa1e833d242e619fe4/82955993178.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/68221185203.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///fobin.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/qm4usn6vts1vljfju31ckf1euv/73310368598.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/35683100381.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/feduzaruxona.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/xekijimijamojikurapaxo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58a24d7e95---67006504991.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105271122503646.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30721ad8f---xetazipomivadanupara.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ocemsve4b7536eptc3k6898h50/91863497999.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a541b4ad82a---7292918284.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2iupl7u6lb1p190ljmea3uo136/sojub.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57188191547.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/27950362733.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/85205963286.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fa247033---43613999693.pdfIn PDF document text
    • https://avflash.nl/upload/files/30037586977.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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 17084 bytes
SHA-256: d3f52df86b1af825f5426b3027c009df6c182147d0d03ffe5afc33528b9002fd
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 11080 bytes
SHA-256: bfbbe29317c2bcc442ad77045073e874d1acbb130a797b0f8789f77ee8d9f43b