Malicious PDF — malware analysis report

Static analysis result for SHA-256 5350ab72359f1005…

MALICIOUS

PDF

103.4 KB Created: 2021-08-05 07:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: d65f3cf64eda09964c015486b65b62a4 SHA-1: 0ebf9732b06f22109262f6cbad006a433d548532 SHA-256: 5350ab72359f1005a98faaf058cf3e0cbf3f506f9ee81e1713231332f1f242e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/298cb37f7443eb57ddfc4beabe4dfed0/30884740777.pdf In PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/kifegakirejijigomape.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/207b5d5ed69697b7311fcc4815bfa2c1/laresa.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/70176909632.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/31jtdtcn8cfm7mpdbe4s4gs9bvl6fi69/teneluri.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc36658a7---dasepig.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/pawuvinojutiguvo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/65e1208977d3728f9f0fbd1963e9d2c9/zoliguxitigazisutikusezi.pdfIn PDF document text
    • http://seamacros.com/upload/file/34531815371.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/40632810759.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/lutebufawoluku.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/91947584833.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d057b7e1b---80554692743.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb85b47fe0---67995293090.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/ot4rr9eq2eluprcbaojuf82fbs/doleme.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/zisagejavopadalimigi.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/3656bc107f4fa658d8a6df78dd0087fb/pisikubukabafipabezujuwu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f4c595f9b3---37452376036.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b9096c15---26246195989.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/rujot.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/34707119228.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/bawazuj.pdfIn PDF document text
    • https://oversaslogistica.it/file/gijopile.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/lekixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=characterize+the+story+the+necklace+by+guy+de+maupassantPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 2372 bytes
SHA-256: 00eb975dcffe434aaeba46b7235ded4e908230d109feb8fdbe236371db421cd0
font_01_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 17720 bytes
SHA-256: 424aba20b827b35ab3ef6b7674ad131d8947f0dc10a1844c23c592b4cea4ea5b
font_02_sfnt_off00015b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B21 11496 bytes
SHA-256: 28d6ce7c389c397ab03eb5d0b4620e7adcc87ad2eea19ae45c6459fbd6246918
font_03_sfnt_off000175da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1