Malicious PDF — malware analysis report

Static analysis result for SHA-256 a437f45e4e9e086c…

MALICIOUS

PDF

88.8 KB Created: 2021-07-25 20:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba60c099c01258fe5c9013221d637e36 SHA-1: 9cdd262b7fcace6bd7a38fbcfa9c2b81867a3077 SHA-256: a437f45e4e9e086c12c504e64a0d98a867a7f2729c04b110b4e3fdd6066c4f66
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous URLs, many hosted on potentially disposable domains or compromised sites, reinforces the phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ourdesign.hk/ckfinder/userfiles/files/61005019189.pdf In PDF document text
    • https://wsbtitan.com/images/file/vaduxivavewamipujuvetezuf.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/gebomizukakaxipezirijiw.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/eea1ed8a68be8d32a9294385456f97c5/26531987395.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8qn3vr4d2peakj2ssej8ov11ff/dupidedawojadumevusa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094a82d0f13b---3042968854.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/29842405966.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/nosezezewenajevomovateguz.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/wiwogibagabetepumafidaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15fbb01a81---tudugut.pdfIn PDF document text
    • http://abnicum.com/files/file/detudibolas.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/80670755296.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/92322370827.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/48e85d960d7b0cef66dc9ccbcfea5929/zamuxusefizediziz.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8e6a3089---vuzolen.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/mejisafu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/77562955289.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3d44c24aaa0d4e2ba001ae3bed1cc880/ribiz.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/kerisamefajugefa.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/virukalojaxosu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecd87507b---dogagokevupigusamepexumat.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/560aa3109e411ccac22d8b7c07228869/depibupadelom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=whatsapp+apk+download+for+windows+7+ultimatePDF 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_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 16392 bytes
SHA-256: d454a65b0a81e99940acf5defd3fe0038a6371a949d40f44e446b08c1c2d6aaf
font_01_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 11084 bytes
SHA-256: 3baad0ba32a4bb0a54a35a7ef0b49557031f9d1a46b0c3bce62e32ab3cda222e
font_02_sfnt_off00013c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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