Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bf287d235a5389…

MALICIOUS

PDF

81.1 KB Created: 2021-07-13 18:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab202d07bcf475dba52d876404d58c5d SHA-1: 7f9faf30a15c927ed95bec797f258ed85fa5f2dc SHA-256: f3bf287d235a53892aa2eda6ac76447cd7479996a5e5e3aa2fb401e6fd851a47
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of distributing links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/27bd54358a5e522840d01b851af997c9/zibibigaguxiroti.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7254b5191---kemobukugonifenoxepir.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/77150545959.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac825f8d0---xifetekowuzibuji.pdfIn PDF document text
    • http://willbramephotography.com/divas.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vfs7s5agne44kqvjme6fdf0i7e/vogijazitilidibajulisurow.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/sunesarud.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9ldhibu0hlplm8r6ci1sgnf54a/42919022598.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/kodopukali.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0f0f874b3aa6fe7a423d324430710dde/49191417514.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8f6186193ed0a71fe0b17373c2ac3e58/rusobalarukabuvolukerinef.pdfIn PDF document text
    • http://allasclub.com/campannas/file/wavifil.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160766e78915a2---90300922935.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ef82d7ea80a1397937b98ac539d7445f/zuraxexurozorefikepi.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215131048582969.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zaguvani.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/63294357859.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a0346a035b268b3e2cbddb1bf6729207/53138252196.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07f17c8a3---56487865725.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/a3s2ht9ent4nclombb2md11svt/16310568996.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2371ae8f---sojasovive.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607988b7251de---97124930422.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/26320815698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=packet+tracer+8.2+1.4PDF 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_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 16232 bytes
SHA-256: 2714d5794be09d1253ac3523dcbf7226b9c50fc6c86bfcd60ba51bc8f09c2f85
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 10312 bytes
SHA-256: d22d21cfd4bebe0bc36c91871b7d6efead2c17e0aafb122af0c5f01c6dbf1c6f
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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