Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedf5e2c9bb534d9…

MALICIOUS

PDF

93.2 KB Created: 2021-07-04 06:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2487d758fbc3eb5cdaa438cc4cbcbbbf SHA-1: 10b8bf402f2b3a5c77fc34710cb51a354922794f SHA-256: aedf5e2c9bb534d950d3e1ee652d8cda916734aca07f4abd9ad01322a05e1567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://alexhofford.com/temp/files/file/6207828984.pdf In PDF document text
    • http://tznjl.com/userfiles/files/14527934803.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cd3bc469f458735ad247e490cc1e30e2/47203571784.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bbff6e3a68ae8f6be4a5df341274eba7/75683744833.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/38871754381.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5ce5ec9da007bc9eaf186948a48ac5b9/17268250482.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4nah5cs2qeitlbkthkdtdd9kkg/gesimo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6fa61170---rexazigatujaxukodixabebir.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786d2816b4d---jovabamofuxogerub.pdfIn PDF document text
    • http://acril.ru/ufiles/files/xutatabilu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b2282fdca1cff394dd5b49a23e07e8fb/ruvujesifima.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/83046223221.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/jegof.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0a77885c9ae3b812b69f4bd0a5b33b19/nonekuven.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b57b0cce7d2---xodatijepomuko.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e6f5deuj43p3mb3qs562hu4im8/31182263057.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfca322c5a---80784964421.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/66533815236.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205195c999---721275241.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mf1o7sjkm2lljtlg3d5e5d1bjq/lurofezaxalinovezogadom.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/nogafevelalewufudemibif.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0d5761e847---lupazununa.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/mepuwogewogawobisuwobi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/panezigaveji.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3132e8ce4c6a7dd08c9796d118af77af/mopidafitarubeleru.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/45490251187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=direct+admit+physical+therapy+programsPDF 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_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 10972 bytes
SHA-256: b5ac964453cdbb470b4824fdbc7f9895c0da8114b7f5e065186fcf68f0736901
font_01_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 16872 bytes
SHA-256: 0fd243a0982c1cdf4608433b051f3b516d24ed6a69b9566546c0347bd66e310d
font_02_sfnt_off00014f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1