Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3abea49330d9f11…

MALICIOUS

PDF

76.2 KB Created: 2021-08-09 00:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35aaa4ce1a8351ec7d6c97a5c75c2e08 SHA-1: 143386ae286c18bf4720c36060e860814eb6d78b SHA-256: e3abea49330d9f11df9522f0b36d402c2f85aba6d1f26d25aeda531b7f2f544c
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zold-kommando.hu/files/48224258147.pdf In PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e73a760f305e739ac0d97356eaa5770a/jamevatulubegaxu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1a31702d1---17811060532.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///87120462001.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ed53e5de5f6645286efe82aaf79a0a14/vogesawesamome.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/42138547159.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/802c4c5b0379a6c84c2099372822d8c4/tidazanikoduxorarev.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/tewemajabanef.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/xoxofo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8ccc639f---28749848636.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35b8e800e---14870081916.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2589b4d759f1f7f183e615a2a33a02b8/dabarevefinizinujeketu.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/72c269bfd2513b12a045c707d4a4cfe9/3565563224.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/27753066622.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/muwibigekariwuje.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160adef24a07d8---55440875617.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/538a1bb8920a63b1cc1ea8661a17b60f/41555425943.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/66664144427.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/m001oiktjruagt6k56hqj6gtj3/wagipepuwinepuwitenik.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/56673492054.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/lezevumodujugotobok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=therapeutic+guidelines+oral+and+dental+version+3+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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 17868 bytes
SHA-256: 0cfdf08ae5a96efc24632f19b748ed008ae07f233c2b4d0b9412ec1b69d5c450
font_02_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 11200 bytes
SHA-256: 0cc958603727f56384e2934b6e26cb46491547cbc6971a4b7f3a9219cbe637eb

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