Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb535f00d060a3c…

MALICIOUS

PDF

88.7 KB Created: 2021-07-15 23:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fb16a5be66a9b04019e114cb6ece020d SHA-1: 1297244253c92b05729ba8fe4492424a7edd0b94 SHA-256: 6bb535f00d060a3ca7178f15a00c4392af2ffd94e72232dad1ed05560c2c6db0
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to manipulate search engine results or distribute malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://artgraf24.pl/userfiles/file/podibo.pdf In PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/duralobumenef.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/mikavagafugorabunawebogu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/nurez.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/466148a007254d1ff0dec46eca7467c6/77600121223.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/88987072398.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6373ba9435---topalabe.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/warosarexijudenoriwuvu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/f93vbv8hk8t8vklcg3s05eb634/83542127337.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/40211969719.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75b4f821db---rewifexijekunuwafopo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/35465969629.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/vivugibajisuje.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nj4eon2kpss5kan9fqfkn4isnk/gejomum.pdfIn PDF document text
    • http://flirdining.com/uploads/files/85369744643.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e275f045dd---31271203535.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/54b8b8d6b7b0d0cf6214a561a6afc9c3/xawumofefutonofosijofovi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5d4a47cfa57c96efdefb734544208fd5/mekulemopewo.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/95958676245.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ae9d461ade7884c6aaf75f9c4a747be9/ragelaxezonugenib.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/fiwujirevinugej.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7e4200626cacf8b8d03b61e271193bde/zovisofokobikajanegogaxur.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/74814568017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fables+and+reflectionsPDF 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_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 10588 bytes
SHA-256: d99731e2ce42747c52bc8b14986cd0e3ede8cff751943650a8f06b0e0e30479e
font_01_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 17464 bytes
SHA-256: 5153ab14ccabe94d2890145e8486d3ca797e9f660958dad50f5c2370a1c1f48f

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