Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b0e4d59516a5a5…

MALICIOUS

PDF

90.2 KB Created: 2021-07-26 00:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 184403db9725537b1085db28ceeef80f SHA-1: 11c3d11e7064f91d9e653a8c14d91021f55cc7b0 SHA-256: 18b0e4d59516a5a571b363407532951f53fea6738d2622d93da53a191fd075d3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The document body is unreadable, but the presence of numerous links to potentially compromised sites strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16071d13893137---silusom.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/nunotazabiv.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854aa378703---viwefunitokonizosowi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/59e6643d16ad1c80f76275af4f48fdee/25870385483.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/ralos.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/11672665828.pdfIn PDF document text
    • http://vce34.ru/attachments/file/nesadubapokeferavofop.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ks25g32ofq4uhlekn4ek3nump6/vobiderasa.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/sefazigo.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/tadunizivideb.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/birepelazipupedawexado.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/57043210980.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/70896038336.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96ca60154---lepefapejobebefilomagur.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/34667050542.pdfIn PDF document text
    • http://strandedtattoo.net/file/75656914345.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9a50ab92---55052988671.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/9478765066.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da16e1c9e88---26917471421.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d754f6a9589---batunibutunerasuji.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/surigekex.pdfIn PDF document text
    • https://pmms-online.com/assets/file/jewexulun.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/dk1l4dj70edi48scdb6anh3k8p/gararefefusa.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210725175208.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a8a897401e51c67b6950434656745fd4/98646646947.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/51347230519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+hypersecretion+of+growth+hormonePDF 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_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 17132 bytes
SHA-256: 4df0febdca773afc8a2f37e156038238fb76261f50153f8252dddabfa958490b
font_01_sfnt_off0001279d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB4 11072 bytes
SHA-256: 7067bccf36e81d80c49c6106c38f3f5462820425759ef7a39d601cab290d6608

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