Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b4044c054c813…

MALICIOUS

PDF

99.5 KB Created: 2021-09-06 03:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f69b8a8a6e5991d6582066d5be519a2 SHA-1: 452a0b8bbb8f284d6e3d686d119cc078359e7e5d SHA-256: a80b4044c054c813a0350db9a9e594ca74dac863ffee5394560e4799f1c28601
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://clubselectionvoyages.com/images/file/filajiwe.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588620987f---wutek.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/kelejakizek.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c07d0ad4630---95301781587.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/93300478156.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/mekivanetenufo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da53da5a1f---41184878263.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aae814c05fe---vuwomuvezaloduk.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1627457062.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/cf059cfcd760fc04e6d9501bf03f4a14/vojemig.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ac948d1bda18eaa04671a3b871dbfe07/8032454244.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/rojawijijureripuw.pdfIn PDF document text
    • http://screen.by/images/file/6682350857.pdfIn PDF document text
    • http://fotossc.pl/_files/file/45766539229.pdfIn PDF document text
    • https://datawire.gr/files/files/52984875606.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/18004178213.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/670bj40rrfh63bgc1sk23drg9u/21965250041.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/90396922395.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/73864635133.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/redejomanezeresabiwuzu.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/lomejuzil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=emma+jung+animus+e+anima+pdfPDF 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_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 10688 bytes
SHA-256: e525d6a637ad9285808053e86a0119538beedf3ecdb84549fff12dfb08f6d90b
font_01_sfnt_off00013786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F98 19064 bytes
SHA-256: f4de26f4cdd27eab94f8ee617f2b96286b745edfc7806d1cff7df98d69747812