Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd98fb28b022e470…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 04:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d2226cd6a8bfdc91c0666f2bb945193 SHA-1: 28b3edf666c945460bd7d0b32525b7c6455c577a SHA-256: bd98fb28b022e47036b214fcfc2c342e75d1933e7e8197cc55f3a6d5e09fa420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised CMS upload storage locations and disposable hosting sites, disguised as a worksheet. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://robwalker.net/fckupload/file/buluzina.pdf In PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fedaa25ca6---78818687672.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/15279990885.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/77f125c6cd15aa574b5b72dba46ef612/difudumusi.pdfIn PDF document text
    • http://mousike.it/img_ins/files/29935903999.pdfIn PDF document text
    • http://bronia.org/userfiles/file/64910556349.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/62915474749.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7b0318e0e87d9264d214ea6edbbb4270/bipetudidilalofe.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/wisezezarugejikupu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d98d7765---xusoxuzif.pdfIn PDF document text
    • https://unitjaya.com/contents//files/lujupowopebegepusowebut.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/zevotupo.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/28091115840.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/89e06ccdab4d180c379be6064133561f/gerir.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812dec2f0b7---sotanazutijavobipitol.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dfh291e1ceqv4vglpkvnls1gi5/kutekimokefudubel.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ki0kjl9v4fcg9qpkv7nl74l38i/73914771747.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/18276138694.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/7b3891ee2defa9bb7d1bcff947178ab4/wobujow.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/17093916811.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/pizagid.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/79688483446.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f9cbec1ce6e24ed5e546f8c584c49ec4/9021650123.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/72716064885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fractions+decimals+and+percentages+worksheet+ks2PDF 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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 17988 bytes
SHA-256: f7967d94dac6df099a9e4702d0974d32b48e20627855cc4f4f239801321add52
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 11236 bytes
SHA-256: 9ffbadf4d28ad828c6d06933a241621749d4d7088942937cc286189e148cd870

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