Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aecd67b45783402…

MALICIOUS

PDF

101.1 KB Created: 2021-06-26 02:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eca73b62c23ec0abc0dd2e7e89c7412 SHA-1: 5cab62f40b50de249245a21157da21a82409f25b SHA-256: 9aecd67b4578340240723c97b12fa1b4e6c5e7b25ff6134832bd6567ad320983
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/25eaad436f4f6f3f5e492b9dfa76b050/kofed.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/57291442135.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ae778e478d40c7361072b37cdbd44ed6/65094575338.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9baee4665---povilisubomilado.pdf
    • http://portaldo.eu/contenuti/upload/file/6796896401.pdf
    • http://dzbnf.com/upload/file///47432779526.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79681a1a17---jubalogoxi.pdf
    • http://arablift.net/userfiles/file/4889121804.pdf
    • http://rolmech-strzelno.pl/Upload/file/fipotexazupix.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/20554857613.pdf
    • https://facades-et-traditions.com/actualites/file/24952267025.pdf
    • https://bobecoingatlan.com/uploads/editor/file/dojuxutasofekiwosibamesak.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c662d35160---14280443775.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fcuua4f7c0ihh8kdu7l06v65j1/50592521247.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c1a2c0861---42133252583.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980bcc819fc---fugozulilufafazonad.pdf
    • http://anvlaw.com/userfiles/file/neponusumimiliraw.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083679282935---nemopevifejawamoxotaseta.pdf
    • https://dycmc.com/DATA/upload/files/202106101222494404.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c622382cac---meximo.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160943edb02676---23120408040.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7e76accbb76478e255f67582bf86477b/nojinigikizamexipojepid.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/sofikotewewanofuvase.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=exobiology+is+the+study+of
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000110f9.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x110F9 18328 bytes
font_00_sfnt_off0000eb72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16792 bytes
font_01_sfnt_off0001037f.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 3464 bytes
font_03_sfnt_off00012e96.bin
29bc1767aa6cd027590e94742fde44533fe57226df475a3c1c0025ed9493c4bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 24896 bytes
font_04_sfnt_off00016c51.bin
9cba3b1dd8a895842978374aa179bfca220c50322cce763f927b59e7040dcdb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C51 10704 bytes