Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1a67647c94d275…

MALICIOUS

PDF

81.5 KB Created: 2021-08-04 01:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ecf8cef3d417ec97c83283a028092e78 SHA-1: 7cce377b12827c1c189fae4ff75fd9068797cb98 SHA-256: ae1a67647c94d2758c5f2c0c53af12d45c40874afa8415cf7501d4ba85229516
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maimungkorn.com/UserFiles/file/kekepiwepivimu.pdf In PDF document text
    • https://aspirans.com/files/file/73070553677.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/vevurupub.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/juwonidiliweginimifarup.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/24913215832.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081cbb22aa29---mixipi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/13121758259.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/88009532854.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/gavigagiwe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775fb7bbce1---tixenekufororaxode.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6835a2cb---71796421630.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfc054dd4---moxotunogezulome.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bbc6ba45a112e767459548a111e9e9c3/tokiseg.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a6da2c4ecbc0c6d1a0a2cfd295223344/zawonigukiguzidugusagute.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fikusimuwej.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/34923578540.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee01b2825d4---dimosapirofimojudiferub.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6b27eb4e3c2c9667762f824698d12da/24125987254.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/pujimuwesezegilep.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/89358040209.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/wabafifim.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/gegub.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/vekudij.pdfIn PDF document text
    • https://ghnservizi.com/file/98975319720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+turn+off+narrator+minecraftPDF 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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 10460 bytes
SHA-256: d25c679796a76c3b1d53eefff98feceb6b86c623711ba6f353062f1a2fac0aff
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 17220 bytes
SHA-256: 1297a1f17895231d49c50545932111ea37d77c5f047a7c244ea71c2396a30868
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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