Malicious PDF — malware analysis report

Static analysis result for SHA-256 b415f1fcbd8f0642…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 10:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66d76f6a33e190743ba6ffaf637d58d1 SHA-1: 03f39cfb83307e00ad95e981b81f32489e05182e SHA-256: b415f1fcbd8f0642cee06d694547faf09f25f7181483cff54e573f9d6dbc9a87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings and URL patterns are indicative of a malicious PDF designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1c745124---sudulipoduxinesiniveto.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1i1mgrfurf819q2vs7fpm6ccs5/wefasapuwokejutup.pdf
    • http://surtek.biz/image/files/20150129_070638.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/unomo77ngn9lopaei9rjh4p202/45258265281.pdf
    • http://gujaratbusinesspages.com/userfiles/file/32567783809.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160792c71efa29---64168091129.pdf
    • https://vigiweb.cl/dinamicos/files/file/jorakelok.pdf
    • http://bjjiffy.com/upload/18964399063.pdf
    • http://brandnewgoods.net/userfiles/file/xovelalaxowed.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4909205d4a---tagovumujuwudowo.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q9kilbik1ea0tuseu1u958nhb7/butukubajigakarozoxiropi.pdf
    • http://lamachine.nl/userfiles/file/52172838282.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/xitinawumuvi.pdf
    • http://fkhd.cz/data/img/56406851684.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfadd6474bb---97708617920.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/aab1e6168aa181fd13bcff63fa65fb16/57133707533.pdf
    • http://euro-ex.com/bemufaxipudawes.pdf
    • https://banghenails.com/upload/file/25181186363.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/52783303457.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870bfef22aa---sovinegax.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161187327885c4---tomolavevogarisaduwi.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076fef92792a---kimewurokibimejifewuz.pdf
    • https://acgroupenterprise.com/userfiles/file/nuvavolikunaw.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d23e7aade---nudupo.pdf
    • http://muzeumostrowiec.pl/obrazy/file/lefazowututufalovufozej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=middle+school+science+test+with+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d280.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 16792 bytes
font_01_sfnt_off0000ea92.bin
7b87ec8cb21e3ea12e1dbbe082dcc4d86e15599e04539d7c51dddfbb168e7efc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 17088 bytes
font_02_sfnt_off000116d1.bin
ca8a4e61e03155192d12d50d1efb91f55cee4d2efe52df02379c4d8ab9981550
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 10796 bytes