Malicious PDF — malware analysis report

Static analysis result for SHA-256 40df8cb3a1e43f5b…

MALICIOUS

PDF

79.3 KB Created: 2021-07-19 14:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d40da69b3a899b37458f0af95cf27a10 SHA-1: a9291dafa290e7d927663b34cd2c698765e24c7e SHA-256: 40df8cb3a1e43f5b111060d88adc35c6af93b06aae04816948f61d268344e70f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, indicating a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/aec05367b7f3f08bd3ac8d4580947efc/zizumovemalapowatozaga.pdf In PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/14310051142.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/86889969734.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/32336727441.pdfIn PDF document text
    • https://ms01bet.com/contents//files/49905297216.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d690c4548360c348cefcb2693cf7042f/84455845815.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b3218a7e---36184069938.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a69c9a2a---jidatowilezenativekoxiwav.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/n91dejcjgud552nsbedi1l4g9l/92044639344.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/bifesofovojewufometiji.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/sph3hh82r9ltdghjv4c48toqk3/xatimuluzugoxasoseguwugip.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/67262050365.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f27f16e5f4bb6920f121ec9d3505a1fa/73293040098.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/3519574861.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/67108592273.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/453a9321ce2124b109cb1ecf512bf377/murafokedasudim.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e73cee93---bigotomelefa.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/61534726178.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/23cb80d4e13bdb885f55530e40a02dd5/lubavezulibuxulipuxe.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/ranajipapar.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/nopesobodipikelaj.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/rilaxodoso.pdfIn PDF document text
    • http://capital96.com/userfiles/file/gunusisagabijipag.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843ac5fdb0---69878058923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=complete+the+sentences+with+the+correct+wordsPDF 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_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 16776 bytes
SHA-256: 3b4139c360751b0c420012b9dd02bdeeb48f2cc540b93a682d9e0f8e5aa683a2
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 10732 bytes
SHA-256: f7e21ecd09ba493e43236e6889155efd55b34533dc8004c9baf82c63525a2c88