Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00097dda78abdde…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 14:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d1870fef072183a2076b906f3052f87b SHA-1: 5db8fd5663b9b2beb98167ec9f50c3843b1b2cf2 SHA-256: a00097dda78abddee88b20e1da9829ce8584686753c9463e06e0b6cbe8c6bc36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The PDF structure and embedded URIs are consistent with a spearphishing attachment used to redirect victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=backup+all+text+messages+android PDF link annotation
    • https://muachungbaohiem.com/uploads/userfiles/file/96919039878.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/raxumez.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8bc28a305.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc877c571---gazivasojuxelab.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5882106d---fujikafure.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/42632093165.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/29604901135.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/letebenizifaradexepakajo.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/sanezixifaziwalumisuluga.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/mutinakeforiz.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fb46105---jekowidepudimuba.pdfIn PDF document text
    • https://bselink.com/userfiles/file/94090225674.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/99192955622.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147da269f73b---4794226733.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210922232707189.pdfIn PDF document text
    • http://pasted-radio.de/web/files/38826733921.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/vatoremix.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/vemusatokekonusem.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/74962770320.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xixasumegisizodiso.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/20871443338.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/37460374885.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/mosalutizediw.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/zevikof.pdfIn PDF document text
    • 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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 11204 bytes
SHA-256: b4dcc5e4306f1f25a6ed9684d58f31c9c8d51e48ca8c258f966c42e10c443b85
font_01_sfnt_off0000ce36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 16588 bytes
SHA-256: 65d5ede99e91e6524f39e9648d623315950d2db8430c8e98e527c8f9c8a1b236
font_02_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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