Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a4b54e8320a1ba…

MALICIOUS

PDF

105.2 KB Created: 2021-09-02 12:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 708475344b6a7b4254ba57581b97b1f1 SHA-1: d5f1adeeff1b7fd68581b2a0021235d39b53e7b1 SHA-256: 25a4b54e8320a1bae6dead94eef8f699f68cd971122470390890f394422f0067
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3rbsi55oa3h5o4brr4e2ht2324/mupagijos.pdf In PDF document text
    • http://asremajazi.com/uploads/files/zonafotukisomuzupefo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/g258t7sijp0sjul3hto06i2rnu/remakiku.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/46020359091.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/86378984623.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/xowexipizuxixijununokeva.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/povb04bk4g4hvhfso249r6l1k4/77896600724.pdfIn PDF document text
    • http://soupworld.de/upload/file/12459873959.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5chhh0rbvlthr8po6ifh27kodr/jukonakub.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee00df0b91---dopinuvekepataxuferil.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/efd993f756aee29a3a1d1d979a1a951f/nijeli.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/jutapekagaj.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/gabibegowadalaxugaroti.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b57de34457e8c480b788ff40bbbad179/fafaxeze.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffeacf37235---tedinofobaravuzi.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/25139697487.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f014b88633a---18538977871.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/3195322496.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/dotuziletixifumowaviliw.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///vivutuzixinekalupebut.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/77c5de8dfd09859733472896f9a86bab/zaxewifopigi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/puxuvutatuwumijulubenex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vishnu+sahasranamam+meaning+in+telugu+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_off0001311e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311E 20428 bytes
SHA-256: 62ebce142e61da520e2a6be7ce33323c679950c26f204bf07ebb4579f2c3b5b0
font_01_sfnt_off00016604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E1B 10896 bytes
SHA-256: 018f1d8ba86da8461ad42d29d895a2261095267828768b26efb70890b985d984

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