Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c775ffa2e6aabc…

MALICIOUS

PDF

80.4 KB Created: 2021-08-17 05:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c76583ee5d7c58318319fe0f68c2fed2 SHA-1: 78361bc1d5f0cdd0917e66dc219046edea175755 SHA-256: 16c775ffa2e6aabcec0163dca2dd764b0997f3ee94ae8165ecc20c24fa20765e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gold-carsales.com/js/upload/files/20632220344.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/dikuwinuzoxazidora.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e4259618c---gopofujugazo.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/23987070388.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/030904294558.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/joketedelurize.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/jalufiduziwidamemelabel.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/29303397831.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788d3bd37e6---sezumupobakatomazodeb.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd0ec4975---37791452289.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/21857146.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f955d6c3a0---70958206500.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hi0i6dq4v22tk4pqlo5871ml07/50485317049.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/25935511873.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/kotipozukojo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/95996672496.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c51d066eb826a617849dde10a228d051/89688591337.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/21264595847.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/98b804d8f576440d718be166164c27ae/88247240614.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e952828db9---43873417898.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/96248721282.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/59627531472.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/658104b7ac3f1bfc8797e602064d6f18/vixuxonizivizukotubetewal.pdfIn PDF document text
    • http://sswjeans.com/files/8217561972.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160768862bf725---lewufaselojujo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d529e1938c---1513732932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=como+hacer+patatas+dulce+con+pure+de+casta%C3%B1asPDF 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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 17576 bytes
SHA-256: 7a93221ca3a7e9f3ea7b82dcf82faaf880474e2729d8dd240cebcf088a6ee128
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 11024 bytes
SHA-256: e7ecc46a4c5a62ba7998e69663761c4327facb9332f6d7afccedc844fd6476e2

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