Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f66afdc43558a7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 22:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 71cd18c12e6638211314ff52d7e998a1 SHA-1: 3f8abea412dbbf5c6ea106983445d3624769348f SHA-256: 38f66afdc43558a7aa78c1bb88cf67f2d58cb3343a15ffee24fe191bcfd091b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised websites or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious sites or download additional payloads. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://buffagiuseppeinfissi.com/userfiles/files/45472296662.pdf In PDF document text
    • http://rcsiprojectracker.com/userfiles/files/2334125322.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/edc4da403ba0ad4cba50bdd6234f9522/dofefeti.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dc2c293f9---gonofu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hme774mn73m8m5rp0sqbp60ldg/vufajifidule.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/adk13brg95fv1s3ucvadpvmcfs/65547191105.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/78505415353.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c7a19cd564ceb57f4d428fe60c0d9084/korapowujejefug.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c921e2058f---48877741716.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb886ddc4---23974836186.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/8d8bodv1n9kof8o5ofrr10e4r3/dubademozo.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/kiwofoluxobifowamefovenog.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160803713c30fc---10858785201.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/14872574404.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/duvukabafanoralasin.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dbb6l62o81fugkgcn6t5v89qh5/1405442869.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/25566041312.pdfIn PDF document text
    • http://webbuilders.com/files/file/josawuwefuwiv.pdfIn PDF document text
    • http://bestcareloan.com/ckupload/files/44536405037.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1d64fdc0f0838aac609ab65173043e83/jetobovanoretiwijazoz.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-20/20210720042356165897.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/bawadidatez.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210718130126712825ggzbg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+a+word+program+fullPDF 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_off0000d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 17496 bytes
SHA-256: c081c6be5db9cf1abf9d70bfb35d5ed03b81872c13662a786ec5b9d4b10a076f
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 10436 bytes
SHA-256: 2bc82067a6d0b4e3744ff084c148d95703d13b1f298c84c0304c15703711cf01
font_02_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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