Malicious PDF — malware analysis report

Static analysis result for SHA-256 3826173b0674a7c3…

MALICIOUS

PDF

95.1 KB Created: 2021-07-17 13:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0033cb0c8b0b35012dfc04fcae637ce8 SHA-1: 148195b1755368be57d4f4e4e9559af953a53821 SHA-256: 3826173b0674a7c3000ec7d999384f8be0e65381583fcf0aba007e5967b60599
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/74129cc014fbc876726c6ea8bbc7436d/nisijovapejiluxotob.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/0148402054.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/84f446dffefbc0ce2be841c861638668/nurod.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/40861723627.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/26961026905.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4p57h20ve60fsitnd47bo0mrnp/9709311398.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c229d48bf2f---mexagimowogulizizototab.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e669b0a41---jadakijapasofonupupobo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f8d254ff6---boviwogidaref.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/nobojusujudekobururuz.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/pilipenesomadaxuzar.pdfIn PDF document text
    • https://t2sc.me/userfiles/madakosexegutewu.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/90029072733.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c01bdaa826009c8968430ab52dc9f88b/togolutokasuxilatisukozos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6c659b6a---nuronamedevegod.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/40b8ab8318b462c24b8beb7621184998/jokusepafunijozuxonadake.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zuwizalitidakixusek.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/kitubaxub.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5f6b0a65e529e9f13256f699a35e397e/87502552752.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/7599917368.pdfIn PDF document text
    • http://fitviewer.biz/files/file/98147414253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hots+questions+for+class+9+maths+polynomials+with+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 11352 bytes
SHA-256: 9d07fad603522aab5399c338e998d7a16f3a07c48b6bf6abcaa62104f84a2b73
font_03_sfnt_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 17592 bytes
SHA-256: 454f16110590c1d341390f575e869b2feb66ca1ce0b82979c11ed581813b7b09

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