Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b75e1868ec8bf8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 04:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b125358a4a004fbfe1dfb2df9b005931 SHA-1: 8e6633efbc9ed1906d0c709ad33f3032cc8ff2d3 SHA-256: b6b75e1868ec8bf811df2ebcedda46c6dd9b161f981cbd769570b2acb620ba20
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://amdind.com/userfiles/file/kawobov.pdf In PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/bc2bf5b51af9fd588f3de9399cafe622/73934179838.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/jifiruvedolaveji.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/39528754578.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/40798724960.pdfIn PDF document text
    • http://besteva.com/upload/files/lajito.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609986a841e28---rimalozizuxujesiligo.pdfIn PDF document text
    • https://anaksemut.com/contents//files/jarirolisi.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/zufigijirivugubox.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a796e287635---ruzazufovosagep.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/70280120987.pdfIn PDF document text
    • http://jarosi.hu/files/file/34195291025.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/80c28d577596dca90fcbda7e2b483245/47691396966.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/bedadi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160924e4f0edd0---59597280350.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/52377297815.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ia2b2rbcq46jiqt269rg54ndn7/32118049158.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/purisolitegusu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/93f881ea0046d5f592e64f185f2ae7f6/lerivefukawaraw.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/nesubapuwoxozexenovugore.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/lisugotexajupuxokis.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/47697224846.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05b32d526---nuvazuxoduxukedasamexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=early+summer+crookneckPDF 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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 18192 bytes
SHA-256: 1fc491229d9aaa128aba07f54e7eee055e4008d3a21749a0c436ca01f5ec0e25
font_01_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 10488 bytes
SHA-256: 50bfc0c37db99f832c3597ed26a7f0509521d82582d0e9fadedf9ebd6350e3a2
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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