Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecf8075c963fcbd…

MALICIOUS

PDF

113.3 KB Created: 2021-09-05 23:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17c857b4d49e16d22938d0782bcaf5e1 SHA-1: 1c04af234ef4a1ca8934d89d83e4f39f96adf10d SHA-256: aecf8075c963fcbd4751300d7346005dd502ced6b8a69e19e0bd13d5f7c852d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/084d8189efedc3eccadb9b7a8aa86061/jufepu.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69db5570d8---37456941310.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/8hnq1ef0oifdk917dbqh38vhe4/gubavivativurige.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcf2049dc3---xeluvaguxivisupepabaduz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbc5919e8---28304747798.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/demuserogaw.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608965237b732---gevekemivaxelivofapuvipaj.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/77c944cb3dc152f209ae9b20eae7b187/wubano.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/kexetipobegisaxar.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/36576138784.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/732565df650bbb1957422d3192c014e3/35370385227.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24740405303.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/92978749062.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/dazomepudetuwek.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/nibegevi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b902e25a561---9011285697.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd192ddff8---67875547575.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8860d5c0f---846712174.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/xejixodogajekaselejek.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/sunojozuvam.pdfIn PDF document text
    • http://sam-global.info/files/file/levup.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/waxizowipupitaw.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/tunogerojofanuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=maintenance+replacement+and+reliability+theory+and+applications+solution+manualPDF 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_off000153a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A0 11128 bytes
SHA-256: 344d48ed4d664bd8a0dbe8fd62119dd28ca11e50fb25bafb4004e3518caede8d
font_01_sfnt_off00016d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18549 19052 bytes
SHA-256: 2f8d2156f94aefba8e8a21d8bc140c770f3472b20b070bcb15a7194afe1313f9

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