Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88f7fec2055b2c7…

MALICIOUS

PDF

75.4 KB Created: 2021-06-27 22:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d666717a780123cb5b2cf05052ce6844 SHA-1: 8a0e02c2f100611fbc493bd333c52a8daeaac3e8 SHA-256: b88f7fec2055b2c706058c28313f3fb09350f1f5bc96a2582a09ebbe2571d11c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=rc+circuit+problems+and+solutions+pdf PDF link annotation
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1e1a1342cab93cc7b97afb9bcc143f80/60845639008.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/xezosufugi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61135ef28---xikodofabekaxodevomag.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/33437035585.pdfIn PDF document text
    • http://texmet.pl/userimages/file/lekomipedanaduduku.pdfIn PDF document text
    • http://podushka.by/files/files/97216512726.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9mo61jdd25knc3j3akpqs0u0go/gawon.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fed1cc03c260148406620dc1520759e7/dunikujal.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/bubinixofup.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074902eb7ada---76270272294.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f1b6fa6a---83008385589.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/13186781963.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b933443e9---wakorabusaxagoj.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/lelobazen.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210621_072908.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hhl7p9e2i7m5v5k80gdn929ne2/11916241389.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160889112cac13---90566796488.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/99071725478.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec43fa89ba---36522190592.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/238fbd6ba25eb4f79ebf97d6aa5e6bb0/zagerabatofevaj.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/zabuwimepuseri.pdfIn PDF document text
    • http://htwy.com/upload/file/30425131428.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ff580dd1cb57bfa0af7793169f8e0a3b/zitupefoxuso.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_off0000c08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08F 16944 bytes
SHA-256: 7342c144efc24f59b27652e0a6eea2d64e7305a333bed5b0618e5d52f36f3c9b
font_01_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 11064 bytes
SHA-256: 9e9281a17cf5e1df6270e22cb49534a3e7c9e9818bada444d3f4add18b635241

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