Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c4f8cb77f18f76…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 12:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 783ff8e658d917858472149825221288 SHA-1: aee660824dd8b3e0b6359050e0779e8c8656f5d9 SHA-256: e1c4f8cb77f18f76ebc1327423421a85ee26448a01c060d355c1cdab7ec1eb32
154 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8626

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=android+tv+box+samba+server PDF link annotation
    • http://pazarziraat.com/userfiles/file/kumewanonalomojux.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/64366771061.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gajopujosuturotuwe.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/37284227131.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/13668938336.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132e601066c3---41914287946.pdfIn PDF document text
    • http://learningkey.org/userfiles/11332155426.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/94857228294.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/49643590415.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/83280438412.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lubesig.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/99872003822.pdfIn PDF document text
    • http://lbjgold.in/ckfinder/userfiles/files/saniditeje.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161377eb361ce5---99951110986.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ldm6hq2cot3sfhouaolf9d0pul/vibowawumeputikafutavora.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/3404276557.pdfIn PDF document text
    • http://analhospital.net/file/files/41539367866.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/monugamurojawapanapi.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/garajawidu.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/32317796498.pdfIn PDF document text
    • http://fedime.org/imagenes/zirifoba.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/15170829620.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/23428151698.pdfIn PDF document text
    • https://polaria.cz/images/file/mapupegov.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vasalibep.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/q05nj8648augaqj65jdcntl4jj/98207431837.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 17628 bytes
SHA-256: 8069f2d659fdb4b2f2e3ad434879792d0b54472180c50819432f2518e78f085a
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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