Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90dfc5871da262f…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 20:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4a74d435397e5864f7a44a82a71ce16 SHA-1: 448fb77ac0b1528ec8eda7245a7ea695ef216081 SHA-256: d90dfc5871da262f3ef603aa092e17a940eda3d44c14e6bfd8537fa3560feb44
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7387643c---95746855289.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc5ebd593---fufilakuvoxidisimo.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/27a1b755b7a00c9ca71862acf26ae46d/77471791653.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0bb02ee02f5d3c396672330768f395ea/77799426304.pdf
    • http://sattosushi.com/uploads/files/nikijawopapagosafoseleri.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/19f166e2a3942352e2e7ebb9fc47cdf6/72047381482.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/28631274498.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/23b5ffacf184e0d8b5d52a642ec665bb/22153649038.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7cd5df1a---lozenaxukedabipap.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d477323a6b47fc6734bd630457733be9/53751224329.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/pjlhpdao8j4ooof0b4djpqkia0/xozugotilobomajotonufu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aef25a9f9---26792877309.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086823dd3c7d---faguxixaxewazopuvepikaze.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c886dd45e50---91437925577.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9753d0ae---69874744235.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31fdef2bc---32201095540.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c379cc477---nebum.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89461f6b6---97138979165.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca85356ed8---mujatobutalegaj.pdf
    • http://phamtrangia.com/upload/files/wisugifirazagotolimumete.pdf
    • https://privatecambodiatour.com/userfiles/file/39656521490.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a5c83541---puzojidomujobugoluw.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d8eba101c06b6b06ed375c2e3e4bdb8d/66362421050.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/fivopifuwugaxukifiv.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/410475d81e993641ac517aa3a65206e8/18680259420.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/ec2d56a7b9801e98effca85e511aa0af/98070601921.pdf
    • http://axiomestates.com/userfiles/file/wixixu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=my+love+heart+touching+quotes
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f825.bin
178f8e092121c411a77a0a58146e7cffe63aa9bf2e38d3a1e3de384a47e7b1c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10928 bytes
font_01_sfnt_off00011128.bin
bfbcebbd7d976c7dec7a2b5a7427421ff14c2969396485b638440d400184857e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 17184 bytes
font_02_sfnt_off00013d22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 16792 bytes