Malicious PDF — malware analysis report

Static analysis result for SHA-256 88566b0c1c00ec16…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 00:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 310d6355c9d33958951ff7100b8db84e SHA-1: fe0ea351dfb149ad01cb59984430f1e63738932f SHA-256: 88566b0c1c00ec166e3653cbaa08a099bbec1f44fab1537e950af2163e597b37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of external URIs and link farms on disposable hosting suggests an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b93b9610c68---lukimanob.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1jsav37rjt7mpdv0h8c062f9lc/nabozetivegexel.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133fe5e872---vojuzokexowis.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/ladawelunikapizesuje.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/99244464252.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/digakixubifibetutaxapij.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/pikusevovozosixomipan.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/mowokoxarowit.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0ad3935d8b16d5edeb14078f8bbf9d2a/pejig.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bde3426fa---tawijarej.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/1275391210.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/24581667847.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/f592671b59317f1cec59838cb99a7bcb/9551585602.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-09/images/files/42466702287.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/gonerujex.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/serajuguboxezowusogatum.pdfIn PDF document text
    • http://51www.org/uploadfile/file/8daf627adbad38a5d9ba03e1ba81e1f8.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/55497004349.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/vogiberejemigugagopezenaj.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/kazozuwovajisi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/87b1fc4075e9ebf88ab83ebb95b3ce2d/18068121312.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/51549870473.pdfIn PDF document text
    • http://lagrupacio.cat/file/71969984604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sequoia+national+park+monthly+weatherPDF 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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 17648 bytes
SHA-256: 7cb2352df8597c85d9e0f5bd2a0006bdaab8d9e220efaeedfc77490405bc3cb4
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 10960 bytes
SHA-256: 86b392737503476728c08dda2ca21aeaa5540754d25da469a861f7dd560f8a88