Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b017d64c05c193b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 02:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 007e5e6412bb08fdc26ea66f91e5f912 SHA-1: a48eae5aaaac6c571c22c202b595f221d0b131dd SHA-256: 3b017d64c05c193be01c66482439a32988d48f35b3aaf24bd4be300633ab5677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of these links and the detection as a 'Phishing.Trojan' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2ca386611fa114bcd0538d097349e883/jevedepovefaludiko.pdf In PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/9974176726.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e5b912fcbdfb96167f904d73164d6f1c/70232712892.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108e9aa293ca---wunarerejovufufuvik.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bbadca1788---17449843855.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/bbc346ce2d9fe54d9a33123d20677cee/vufezisopilazonomipe.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/53516170682.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/89250059498.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ikolfq4q1361s3qlo4shfo5uct/53853985222.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/zelutabipa.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/vuderevuza.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/44393154102.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/64752256746.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/84547a72f5d89fd628411b10af44bb95/69504597549.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/92395435280.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0013820001620031369.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/212286qk60qp60iijbs577f8bv/5567968886.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9022d2e2b---3547396620.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/aaf83a34df4f2c285cd7313707c71ace/38852779943.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/i09ausa6dlf11n88pqn4cl9t20/xoxokowarupo.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/072bc31932f596a7d0ddf6b533f934bd/figuga.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210815_F94F059B850151BE.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/letemotizit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+not+tremble+when+nervousPDF 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_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 17200 bytes
SHA-256: cbcad88e12dfe0adbd8287b6d65003c597e58925ebe1b27a8c8b8b4597106b7b
font_01_sfnt_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 10504 bytes
SHA-256: 564af5e6629ab1225d15fd9ffeec339eefe1662e06bc7868120eb65945d64875
font_02_sfnt_off00012a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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