Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de45bcad5bca7ab…

MALICIOUS

PDF

83.8 KB Created: 2021-07-29 20:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c466acd738027d75a9fa8eee5e3d22a5 SHA-1: c8aafbc23e40ce3788604d55b1aff285d979b402 SHA-256: 8de45bcad5bca7ab9790bec589c6ad6b46f529ac59e4367fcb16137874a1004f
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs hosted on compromised CMS uploads and disposable domains, likely to facilitate phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://montaze.org/democms/userfiles/file/fupunabudogozufatotubigen.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kpj96jq172bik9i2qvmkc5vv96/35840675100.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zivat.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4b6a077f---68460148631.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073798f13d0b---purogulivu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m7n0tju3a39g4ol7l0cvb6mkih/91552541583.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/deweselutabajig.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/62326596877.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/use2qk9ilmnemplaco3du7e36i/40794512028.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609f017078b08---kapajotibipone.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/a64pvkfcadbt1bd1o31ns7e7e6/18384685778.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/12529162769.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb7dd3e1a---moxebilekutezubule.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/toxebodovuxokugejatewibo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f371245a2f---tebuj.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/vi4h6j81u654t596ko81d4r14n/patajedigusofuwapexogevi.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/87224632172.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa35b097aa9---83954514157.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/15821348127.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n9oqfjf7b44vruclo0jh2t2u57/41782958058.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/2595133231.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b6e11921423a435dd89c17be72733528/16864947473.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/pepudumagejerejeten.pdfIn PDF document text
    • http://grabnerestriche.at/tareboluvavaweru.pdfIn PDF document text
    • http://ciskmv.com/css/file/59207573411.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/jonisabejujobelebeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+blocklauncher+proPDF 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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10736 bytes
SHA-256: 994f199cd0f5fbe7eda633edc27fc03b8092c149246a0d03ca77865afbd6c11e
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 19356 bytes
SHA-256: 59f2799018050d9c16ea6017f1dc92b7b8942d24cd0e55748d9e6421c3d33c10
font_02_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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