Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f802abe2e7266cc…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 15:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84e0d77f9b82eb2a2ed13adafd6d06bf SHA-1: ed2fc2948347c2199ea2972c676ad0e6d82b085d SHA-256: 3f802abe2e7266cc52529eadfe39afe3703b33c682b7998fda4cf87a09283ac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also flagged for duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://elemental-ia.com/userfiles/file/17384953139.pdf In PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/26063211993.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/subinisuvinip.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/lixuravukigikadelezutiza.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/kosiwudefelatojejigade.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1du10b3b0a7hefnddg3ch6sf76/xiburazapomira.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f317d05b0---92067130641.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1a5749ccea789d656253ce8a792154ac/60418513100.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/210505c4992b7ddb332389876ed4aa81/4955932586.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7bf19ad04c---98765495650.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5741ef809422be426a9648e28dc5c739/ledefozalu.pdfIn PDF document text
    • http://maidichike.com/upload/files/95210025254.pdfIn PDF document text
    • https://actorconseil.com/files/file/64045689474.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/44250846182.pdfIn PDF document text
    • https://people11people.com/uploads/File/47734486429.pdfIn PDF document text
    • https://luminex.pl/upload/file/laligenajujituxerexab.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/talunaz.pdfIn PDF document text
    • https://parfumzone.ro/files/file/pomumevirorin.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160912b720cd01---sawedaveganufejiruronol.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/39211435458.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/75f989bcf3f269d8e17d4a4b7d8e19fa/77890631502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nse+past+questions+and+answers+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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 10752 bytes
SHA-256: 76aa568d56696d8a30fee7fbda3cb5ce4a3d69f2a0cd26526dbe2d0b58cd7103
font_02_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 18116 bytes
SHA-256: 5e2da1ce6007d1ac52c6b8ea00217da28d721a945a527e34a3f345c5425c8e77