Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de8fc9f45440962…

MALICIOUS

PDF

202.2 KB Created: 2021-06-26 13:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8dc4067ff7120ba44306c2112a35f543 SHA-1: d7f82b230db78ea8bae914afb0fec19c7d4dd849 SHA-256: 8de8fc9f45440962ed98972079c526de218b7573478f371a8404e7c06b85036c
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files under the guise of free downloads. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a phishing or malware distribution scheme. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

Heuristics 5

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e9928baa6a41d32f44750c13c33acca5/15512648347.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08baea07b3---94399561215.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/xapokirudib.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ac54b73---bebegibapavisowot.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/46703262531.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/nabetolejoxaxinogekatowet.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608531757310d---51487360641.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a0de129cdb1ef9e839df48d042aa55ea/61196719474.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc9ed09c9---wujarusada.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/71319339402.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/xopekinonoxosafixikip.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/21975509839.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/fijava.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085dda6ef87e---14789297373.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866d18cb9ea---50019961260.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/lusazo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fa0e6657---zokoxetadunufozinazenexa.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/dewixadutuxu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfac16a11a---pelowoferelari.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/13113457220.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a574611404e---wunikoboxarukib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=meditation+meaning+in+malayalamPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000288ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x288EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002a0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A0FE 24124 bytes
SHA-256: 0b797b79b1cc6b460dbf4258619939f70bc22776f89e0becae38f2c235e06515
font_02_sfnt_off0002db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB88 2788 bytes
SHA-256: 6c18557b73d176da338184c1972bc95cdde55da16fbf3e9dfdb6c93fe7b2ce6f
font_03_sfnt_off0002e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E709 10432 bytes
SHA-256: cefc9891a6e613d4365b8a8cea8862d475216e8bcf9622816807fee5fa61e468
font_04_sfnt_off0002fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE69 16924 bytes
SHA-256: 9c35dde73e77ddc2ab75e2f546d9354ffdff019d9a892c55d212165147150b25