Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b02d2fd080d0de…

MALICIOUS

PDF

73.3 KB Created: 2021-10-01 00:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5a85c8e2157fd2bbce656246ca08f7e SHA-1: 69bfa1a83e683c36c626bc42edac728d7f83380d SHA-256: a1b02d2fd080d0de90fa4ea2c68bc8c898b46fd4319ebf92db47b7b23a9478f0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms strongly suggests an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=idm+free+download+full+version+with+key+crack+zip+file PDF link annotation
    • http://gelateriacool.it/userfiles/files/79357018246.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/tatalajavonarotetufibegat.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c5440ef5904d3dba5ec3d7750a354a8d/dogajomeref.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/tiwop.pdfIn PDF document text
    • https://trystsalonri.com/images/file/mawefikalizadafexosos.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090313480270554.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wibadojadipanomobugup.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/87575048083.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/vemagedumitikid.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/59070030487.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/vuwupikibawufexasoraf.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613793042c42d---fugafikixuvijinen.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/nisudamasurabemapepi.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/11441704263.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/63072361168.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/53151963779.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/30161281056.pdfIn PDF document text
    • http://spbi.cz/res/file/fugosawivuwiv.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/rizimuduvutazejoxemorup.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/73291039029.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ktac4glpqv09tfoicntu4u2ds3/4751088987.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a23e2ae3ec---72585066908.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/zeloxemujinupuvi.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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 11356 bytes
SHA-256: b05e0febb92f8314ae56f74e4d2a8a9ae4331d57579fc13fc4b8145f8c20be00
font_01_sfnt_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 18392 bytes
SHA-256: 11129e96d90856dc108ad99af8579243ad80151bc14137f008a104abdebd3237

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