Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b812e10f109b22…

MALICIOUS

PDF

85.7 KB Created: 2021-08-16 07:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2b8b89267566a250fa698542ee7aa9a SHA-1: 25f56b17ee30a840224a7bbf0dbf205ef307bcc3 SHA-256: 21b812e10f109b22f1bd4fa9a2b91d49af7c33e249bc7543f857c28d94bdf4bb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search engine results or lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kraski-chernila.ru/resources/file/mugode.pdf In PDF document text
    • http://classicalgardenornaments.com/uplds/file/ruzitozuwes.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174e274f10---81901793095.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/gulcgdqaov00al6sbogd9d3uap/15210381609.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/78765259523.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/81572810287.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/gufewupodoloxagafabor.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/42417100156.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/vesuzamisalofilozibilim.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/dutan.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e3f5fd8f1467c6c680b25e61d067428b/limemizamefofotipo.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/8278138064.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8e90129b2707f79f3451044ae2ec7638/36375346489.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa947370cf---zutufetijaselotuxutipe.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/3688ee79e6dfafa7ba5a569c4428858c/kasewefejibizaziro.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c5e20703aaba39600e163bf208735fc5/notafejemeleretalovisu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609de10785b86---lopisonapubusivimubireji.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/tirabiwunexifitizexamod.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e6f2c8cf903eec084879fc8988165ebe/54350597537.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/37928831039.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e655e81e3e1---nakowuriwaleniruz.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/10683719737.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e374eb39---wedujulurafojininajuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tuberculosis+definition+simplePDF 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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16472 bytes
SHA-256: 336f60d79d8775b25cb2ac334cfdb74bcf8885a44a64b8363873d3b7b287d213
font_01_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 10824 bytes
SHA-256: 7dd0bdf2b94a35df56d6e545a412be8fa7071597a4ed9a33518dd263cb7615a2

Open this report in the interactive analyzer, or submit your own file for analysis.