Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a565eec028786ee…

MALICIOUS

PDF

95.9 KB Created: 2021-06-28 16:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: afbf37e4bbaca09798bcd378f448c389 SHA-1: 6f5cb0c18261aa69e34e4682e2ec8fb94a6a66cb SHA-256: 8a565eec028786ee022931ab31fe111676436a42716f8bf5c9a6db8692672c71
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://catamma.ru/uplcv?utm_term=2+thick+feed+in+braids PDF link annotation
    • http://sequirk.ie/userfiles/file/57126662804.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/269b2f8c40d8681816926525016ddf8e/tuputiwes.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/rarakowerulagotonaxok.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad230247981---rudikava.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/pofikixo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1671b705c---67665380570.pdfIn PDF document text
    • http://atek-ent.com/upload/file/86684376479.pdfIn PDF document text
    • https://akvaguru.hu/user/file/purofuvorob.pdfIn PDF document text
    • http://iphysiology.ru/upload/livaxajowawipukut.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/rowop.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ba851765ae6f484a472f24c9eea86fcf/70298583964.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/70mjkctjnaab095dmfb3dukv3n/lunose.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6441las9i5a9mdamm69k9ggd0/modipekonekutinusazidowu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/vojiragamex.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608382a80dff8---xoxusurepakumev.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/vititipukerorox.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/smh3b5p42pon9gogig6ljftrks/fupevomugafobe.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ee1b5c412f395a93ca2dae3cdede7f1/95109412805.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/nigera.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/42688365907.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f62234bc989e7944e0898c9d0aa27dcb/1540358550.pdfIn PDF document text
    • https://elektrona.cz/files/file/dakenixekigapumadaba.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bd83d54474caa9fcbc292a1c1fdbab6c/79446587067.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 17540 bytes
SHA-256: 738cdc64e1b728476140c4bc3c04ad6640c10f966becde47a1b113c7db66879b
font_01_sfnt_off0001231b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2C 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000150a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A3 10664 bytes
SHA-256: c429782a63cc5ee04ea83c4d2fc09b7c401128579817603aedf5bdfa490fc830
font_04_sfnt_off00016906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16906 1796 bytes
SHA-256: 755b843c3a20f66ea68988c6c55ef5c5be5f59bb004e03bff28a6134c7f942e8

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