Malicious PDF — malware analysis report

Static analysis result for SHA-256 66acfc4ce7fa1eb2…

MALICIOUS

PDF

86.9 KB Created: 2021-08-14 00:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 835e587d52019265866dadd917604e06 SHA-1: 0d62760da5737f24a999c965f404dbcaf7cdfa45 SHA-256: 66acfc4ce7fa1eb26b06cf5788804db071736e89f75899f32fe3d9bf9fc48c0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure as a link farm suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://raegcafe.com/uploads/files/ferawafalepodinedotiba.pdf In PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/xezexesituxironarone.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/84212789185.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5d5d0a6d---wajuwufurorugojepenop.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0r7oajb4gi769d6pjl5i91b413/95610593819.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d42b489b---suxurekenebofozaseridaf.pdfIn PDF document text
    • https://mauspro.net/upload/files/lexirulolivilibukaxo.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1b7697d366e6eb9b839bfa89744c505b/kimebobafozusiganag.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/wadijuronabogevuvon.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2efaeae63295fc5ae0d8719a1db0a4b3/wunijagarijisewurigemuge.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/78803440844.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/sorikut.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/koleremavazore.pdfIn PDF document text
    • https://ms01bet.net/contents//files/zebigilobejewo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wekebedopukuroxigosovefen.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/77621546912.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/83983423956.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/34853179512.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5ke6rj2egojskb60lrg2287vs1/86307258181.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/50829940318.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/pfkiku81fnulj3q6fc6h6i35s2/26850992415.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/53295535391.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e48c60b7cb1---64376784127.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107022103591830.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607428a41cebf---fuvopo.pdfIn PDF document text
    • http://berbun.com/user_img/file/japapuvafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=naming+acids+and+hydrates+worksheetPDF 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_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 11040 bytes
SHA-256: 8de046e44d4fc94aed76483a1f33fd371aa12e8a55d0b44e697b771391a8165a
font_01_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 17332 bytes
SHA-256: 018338e456bb9e052077f94e63d53a98d7a96af1b4faf8ad1b1f0b42bc72b06c
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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