Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfdc3b26dbcee9d…

MALICIOUS

PDF

86.1 KB Created: 2021-08-11 22:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ef734db49282c9ab9a213b6e0def754 SHA-1: 01512d6806addde70ada6d71eccd933499405c0d SHA-256: ccfdc3b26dbcee9d9601c57a645268a5610f947e7ec4524dc6031af61dd4a566
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern involves luring the user to click these links, potentially leading to further exploitation or credential harvesting.

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://ivankotov.ru/img/lib/file/45668273828.pdf In PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/buvalagipi.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/gewejajexiki.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a3c698f4589dfc57d3f690c6a0dad079/namokajifevefufabaxaragob.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed531f836---57331078042.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc823b8b78---81817301210.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a502563aad---pawoxobulaze.pdfIn PDF document text
    • http://patroha.hu/file/watodizavulad.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/jujifurupajixof.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/734c22273cd79397a3cee2eb33489365/punaleb.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/rinefoxuwej.pdfIn PDF document text
    • http://praguetransfer.com/files/file/67048846850.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b559a3ccb---vavesiripivikitovisa.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/db2fb16451ea4243f30cc882f671884e/titobajix.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/boxujazage.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/molebazafolurewe.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/cc96eb725466c3cf6ad56eb7571b8e31/31756707739.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/97355530332.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1v9fh4d48c3e4tmlp3c45cb777/vebofonemitadakom.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/77bctnu9p4kk20jeoo6g27ert1/90929685888.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/77684030524.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gupabuxezipobogafubow.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bjbcfbsi2ofqe93h3tbn3ducv2/mejuv.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac697829fe7---36861218765.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f4f112aac97dbc9ebcc531ec7a1a5bef/rurom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+life+in+little+alchemy+2+youtubePDF 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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 10976 bytes
SHA-256: 64c981a6751caf5ac3f4300e22b5095a13ecc0b52c36e22430697f63fef28148
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 17132 bytes
SHA-256: 75376514a118c2ebc595119cdf7e215ff967dc4d90cea60dc70de748fc27cf36

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