Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c77387e9adce0b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 01:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2658c8fcc06b23b5b8cbf302ba1a9aaa SHA-1: e9f9f7474aa945713ef52def6d5c75c308ef26db SHA-256: d4c77387e9adce0b32e2772f863ffcb28ec455db8e84b4e11d77a8ef32780ff9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'SE_URGENCY_LURE' indicates the document likely contains text designed to create a false sense of urgency. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://technestudio.eu/userfiles/files/8755775403.pdf In PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2u28nrt5esm81pjg8ovcp0561f/50274063478.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8a9e8208cc9aebc066f475ac41111b2/nururakifomimiwositop.pdfIn PDF document text
    • http://bastola.org/userfiles/file/71673979447.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/51525822637.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/sjm4s1s04dd414n505ls8b5f4n/bilanozo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2eb70ced59a529422208ecc09925e5ee/57700686021.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/32225057940.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4d6054e3f---finibudilopudumu.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/wewunufaberebokemamixamej.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160861790e4bbe---25058718536.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210905064807_2ghywk.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/51bd75bd93fe3feb2ae21f671ce96ad5/kebirovoxujufulofor.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/74914085680.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab7ba8dc3---46132657841.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/vamowalukutuziwebitada.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/99dcaa63a4a889690d79c0f65dc2a156/vovurejapow.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6c800c71853ab4231aca39ecbc83c672/32912958520.pdfIn PDF document text
    • http://stl-hk.net/userfiles/sogeredapewi.pdfIn PDF document text
    • http://lecostationery.com/files/file/somutosipakezi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbc736a8d---nifefuf.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa26d9e3f---50169230811.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202187224417276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=grade+10+geometry+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_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 11456 bytes
SHA-256: 75ebd2a18eef202eb54ef3a0885a6828652a34c7456bc2270860aae3a4ef9db3
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 17440 bytes
SHA-256: 0f7372afb84e87c1a5b95ecfdea5b72befcc1d74a14145588379d757e3833cf2

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