Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c51ce3001cd52be…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 05:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d73c3003fced1dc5325226f3ffcab7b SHA-1: 883313cef41f62c0d76700f14733428770a9d4a0 SHA-256: 1c51ce3001cd52be3302af337884bc1185d1f037eefa35cfc66da24dafdcdb24
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for phishing content or further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a384016ed00a59b6627907ccc20a94fa/92134648558.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b5704af846---tiburelidufamenusid.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d8bc30aea---9707769921.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/gumixalivazofixamuzul.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/11935265920.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fbcf849ce19f67c9854ca0b8380336cf/72108983686.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/41996754855.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e3c9351dd219f74e91ff1376794c93e8/38479327364.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608930602352c---96335703496.pdfIn PDF document text
    • http://axwelindia.com/uploads/gitamidegeto.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/112ec3c700b6c2e3e2d4a29659e20e41/73386234841.pdfIn PDF document text
    • https://aspirans.com/files/file/xelanofuxuwekijivimiva.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/4htk4o70903nnvajrgkhdogri6/dakedibubizugavag.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c1045fdec---5964697865.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7f6e66ce---18537244713.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4f54c6518adb163949aeeafb5a4d8b59/99053623264.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8c1e2m358q27vm3p68njfp2fvt/pasezimibijoluxadufa.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/saxevij.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/dadufaw.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ffdb831816306a8035ca6946407c3854/saxuwuvawavesalopum.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b632f3c80---34699685158.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607758c81f314---55010813104.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2bb0979d---gufuzajipajizonero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=analysis+of+financial+statements+ts+grewal+solutionsPDF 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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 10960 bytes
SHA-256: 04ca319f07f7ec92f7699d6bb5d113bd1629e8191636d809637fcde9c8b027df
font_01_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 16740 bytes
SHA-256: 9de37e25cb98a45645f66e2ee2d6b72aea29889d80cec57711cc1c269ac4dd21

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