Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf057a638256c78…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 23:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8d122587b41700e7626d1608694b474 SHA-1: e891fbb6915c7ecb90f1de7462d677f426e275f4 SHA-256: fbf057a638256c7849a50f4f15d4c8b44baa431b84a98d4a20494bf4e4f3de64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of these links and the overall structure strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34198422537.pdf In PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8cc507d70dacb5079f99a78beace5411/jebixomew.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nnkf7gj368qgti9ou1h6plclkk/48564205728.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/26364995384.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/xuxevavuvorosubatekadonun.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/67157669049.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4bcb49dac---zekili.pdfIn PDF document text
    • https://silga.ca/userfiles/file/xaledidurenosuzo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/bd3ac6dc0238ef9d378b68acba34b75b/43156441330.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/denosujemive.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/07pubimcev4loj7kld306je8s8/52948556165.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qofbo10lqcmjfbdjsu5mrnn4o0/puwolububerefefun.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/gijeduzulamakodujenek.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/gafegituv.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb12db89a0---xatuzivijijefoderisilij.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/53966272924.pdfIn PDF document text
    • http://blueyee.com/upload/file/151511227642.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/5776973989.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/sulukan.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jamadi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ls1u5bp9cchnk5hga7jm4jdjr1/88083096038.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/69436538429.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/64963012459.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/97373037702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=peranan+enzim+dalam+proses+fotosintesis+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_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 17528 bytes
SHA-256: ac5f11b717af4d2b599b0e221ff2d9d82970d403ae96a613d7e2f653051c9717
font_01_sfnt_off00013e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E97 10720 bytes
SHA-256: 1260967ecdf942a761269cf609405fd1e446b1b1ff783c3e63682c451dc8f7a1
font_02_sfnt_off00015732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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