Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9197d041e777f2…

MALICIOUS

PDF

99.4 KB Created: 2021-06-30 20:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6de22f33ee38c8e34f71b2db5f169962 SHA-1: 9a7e27e6c12f5db672966846bf921f4f11220fd4 SHA-256: da9197d041e777f2ee675319364233fd4655dbf4d0f5e7a9c99751acb3b8eaa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded URLs, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to artificially inflate search engine rankings or distribute links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://queure.ru/uplcv?utm_term=need+for+speed+rivals+serial+key+generator PDF link annotation
    • http://fontanarosaserigrafia.it/userfiles/file/79133663806.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/mivimobugojugovoxorud.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be82b69f372---pogululifonevifetep.pdfIn PDF document text
    • http://bjjiffy.com/upload/57261724237.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e14d4e915---relenegedif.pdfIn PDF document text
    • https://angkagenap.com/contents//files/mapumasedulujesixodato.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/kagulotet.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/movuregukaturoladokeji.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/7de8d1904f4ccb37387a5e912ba6c5e7/xunegexoxijisajek.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c123ed36a0a---wivigugarusoribakositug.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/krahm6up0ti2n0cl7hjd3k0m16/wurenupigowelopimoj.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/33771168795.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/a7nb09eamkpqvrieier1fuogq0/12730111604.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c59451afe36---57851581946.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/45578704741.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160832d4ef1fbc---38645366154.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/1333873726.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/wokekidofipegafotuz.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/xuxepurinuzifufejizideze.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/40ec960fd6eee2b9eda629e9288a3551/releruwosekatutares.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/wirixoginulusibexidezote.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wapikowexidibek.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/fca96c196b7987ac54a78db4999ae28c/buvek.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc2fb68893---40965233581.pdfIn PDF document text
    • 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_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 17540 bytes
SHA-256: b5491b7562f096880dcd56b26e0d7e3ef433ab4cbaaa18a56f293527821529e6
font_01_sfnt_off00014f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16796 10920 bytes
SHA-256: b35744a2695d0e1c9a5542843c6ad825ce16a07eb587fed282e83aba35e0172c

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