Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce8b58589ea0d6a…

MALICIOUS

PDF

86.0 KB Created: 2021-07-05 17:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1124d55c91168a4b08bf8d1bb7dae122 SHA-1: 3e8159ab4ff0140e82752fbed3acd0273f5b4604 SHA-256: dce8b58589ea0d6abac2320b68ad7556bd964edccfc1932d1d1303cefed34972
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites and algorithmically generated URLs, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it is designed to redirect users to malicious content, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1cf5a8d3d453fc2f37d76cc5df7d7703/23975685088.pdf In PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/94b7130539f91f8681bc804653f916d3/ruwesotifutokodadukolod.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/42706794466.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b457d0786f---vadofijamuremumop.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/49156158452.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/68600864013.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/40938831196.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a02e8b279---ravewuzedeli.pdfIn PDF document text
    • http://partnercable.hu/files/34409894228.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608502a3b410d---40002828037.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/eb2a949a0523e3d2a649f79abf287ae7/sawexivudomopikuka.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c89da18e6a2---dukowefagepigopinowov.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/fezotedizavumug.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/nf027p5227g06hkvffdnck85mo/pufamukene.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p2b5gm024l3lejkp9oj8rvg47n/vekajolevodu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609401d452c28---82934213713.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/3982617321.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52958221451.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/33116141210.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eof5t3mnsiei6or5snq8irbgn3/6066790044.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jesehg3s0vq6pe69roh3sb9o15/31332054839.pdfIn PDF document text
    • http://www.bash.cl/media/file/46314853195.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b873e75e6a6---91837712929.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qng4c0odqsei28h7em728no582/sedibabasurogerobusage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=whmis+2015+aix+safety+v3+answersPDF 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_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 17664 bytes
SHA-256: b77c091f253793ac7e4e2e384a0b659820e8a5e0c94f264aaf3f5a9a3e3014d4
font_01_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 11276 bytes
SHA-256: 3f79eea1912599cc542f1f4e0ce4234505fcea15895d5d354b084ded1b365d4e
font_02_sfnt_off000132c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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