Malicious PDF — malware analysis report

Static analysis result for SHA-256 1731622ba60ec89c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 10:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: faaa81a2a61288cae5773610e45d8c71 SHA-1: dd40e9b1bb5ed4863f267e779198ba4d48f34ee1 SHA-256: 1731622ba60ec89cf3eb13a385f9f4f27a6b0383fac5d74a963683177d3ef58a
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malicious link distribution intent. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f5735b782c3fb6e447be5852a94cdaca/fovudidumufivubodopuf.pdf In PDF document text
    • http://stjconsulting.it/userfiles/files/tanimepofanutama.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/tolosiloke.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/bd123d97c8190e18b73c653e028fb3f4/17190353031.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b6c396dd25a91b10063cc8b9ebe30d7e/97606006066.pdfIn PDF document text
    • http://cichanski.com/Upload/file/21698130144.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/82376714df0487b4efa7cf46694396d4/xuvinoresasufokivoze.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a84c1d22---pevozitofoxadexugetugoraf.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dgqbb5n9rp2jfcrptj1ca3ehb0/10664531981.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/72912560137.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/13362643644.pdfIn PDF document text
    • https://defi128.com/userfiles/files/38269698131.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/55703267944.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160708ff09a04b---61935376517.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820b55d7928---41379605604.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/xuteramo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0c9e0b71690512f34aed8b78d87a10c1/5850785573.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/aacef05b3c15cb379e89aca4a933436a/42000237499.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/8kiqfgcod6i970jb644ajb7e3o/86008505110.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/wobokota.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/947cb7cee456a828a0ed6109bc4f49a7/81464785493.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/mediwexemazilaxevisikuri.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/xerokilaxadora.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/bodagidubet.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/50792141848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=samsung+fully+automatic+washing+machine+6kg+user+manualPDF 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_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 11420 bytes
SHA-256: d95202308e657575be5d01e014c370e011195c61dc0dfca5cdb51f5a2a0793de
font_01_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 17776 bytes
SHA-256: adf99a729588f721d4d6e38ee8f2d82dee4b5a95955f9f3de4b356d2f523811d