Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a36e21ef8b3a887…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 21:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 529558b21e5697851326eb81cd59a4e1 SHA-1: 1a325708adec1cbda479a90809c2cd00ef114dd3 SHA-256: 2a36e21ef8b3a88704e211b161e5046ac6677df93eefea8c5d9b71e00cdfb4c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or further malware stages. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://chcial.ru/uplcv?utm_term=manual+water+pump+price+list PDF link annotation
    • https://trisyscom.com/userfiles/file/musevuzifenuruw.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/lilovoj.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bcblns22q4r4orb44pntuqir7p/bexuvatorirodak.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075768b5138d---sipobufuferujugawitaza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d6d90ec33---fidutegifuxajixuxolu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///guwiwirumafosobojugugenof.pdfIn PDF document text
    • http://didopack.com/files/wudoguvesom.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/34bfb08399afb58b92ee0bd989d95ac4/58236009928.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e492ebfe---wesixap.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/bd78050a869b228610ae259ced2d25b4/76496628306.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0849a64d1110923ed280e84ca7481aa2/36600908204.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/segero.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/53537704976.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a76be511ea5a07e44e3c3fb7224f325c/mujenupepak.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/4347514815.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ac21cede---67397834120.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdd9bfdce---13564283509.pdfIn PDF document text
    • http://123dvere.sk/files/file/jemiwaxoja.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/faef687f122ec72429a0aa9540efdc5f/2932800446.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/aeitb4h0psre431mqjitkqgkp6/benoronodor.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/92322120981.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3a04ea5d---wesexomaxosabipuvow.pdfIn PDF document text
    • https://rinducm1.com/contents//files/xodixadabizixek.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/87574781121.pdfIn PDF document text
    • 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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 10596 bytes
SHA-256: df771e82ae949ebf50e51fe5102ae88d2ea0212ffb8eeedfadb540a25471a202
font_02_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16024 bytes
SHA-256: 65d3e55faa08c7e70240265af15c05d38a4b94d1838c4bca8fa1ef10bddf4c6b

Open this report in the interactive analyzer, or submit your own file for analysis.