Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b35d25d9dcc137…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 20:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04049568a48e52bc9406afbe64f398e5 SHA-1: 0aeca71d108ee9c7ac3e1d2c7adcc1a281d3a7c7 SHA-256: a0b35d25d9dcc1379f4d6f7f8d85bb9357baef763cf768bc8f62de50653401e3
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, but the presence of numerous external links strongly suggests a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/870c6ffd5b640fd664c1a93a22d7c473/76648095467.pdf In PDF document text
    • https://pmfegypt.com/userfiles/files/84753557799.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/sutijujapafifabuz.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/n2c3ncvfk3n4j281p83mqk38h5/61200208325.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/61279314998.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbaee8209e---tuvibiramobavesalaxowi.pdfIn PDF document text
    • https://rcot.org/userfiles/file/79759985546.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2be4c689e803d6bc8e51b6d5b609e3da/modulimapix.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/libubatajiwij.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/92824548278.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9c20175d---20023814705.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/15320836346.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763124e9a43---viberajatuvepesisajipug.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00781ab77d---88684955109.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36459abb0e---rujorip.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/81043794543.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/58226285058.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/87814042331.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0b47038c54aafa5db5941478b863e2c7/kudimegekotadozono.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/dewopazegisubimuwir.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/28260629722.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/746958f7554a013ce75c0b76392b3124/57186134883.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/maxunalidu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94942978270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=medical+terminology+book+8th+edition+pdfPDF 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_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 11448 bytes
SHA-256: 58e0ccc017f9385217b4119ec38d3999f6a3d576c84f27cd1f1fddf702b805bb
font_01_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 17312 bytes
SHA-256: 41a998715620972a8d252c5102d54c8e66d61c5f43acdef736d53329cb786304
font_02_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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