Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f215f4de97e080…

MALICIOUS

PDF

90.2 KB Created: 2021-07-09 01:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9aefc48ce7079e40963378946401464f SHA-1: 92a1c8fa15e7e18f79e80a9740d763fbcaaca3e7 SHA-256: 37f215f4de97e080f9367eb0d615b63c4d7ba66da0f758265dffaf6b59d497bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely serves to redirect the user or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/e9b843c622afce56c457af5539c04c80/jigekodeve.pdf In PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/tdpumm1kjr1nsj3qm3759hkehv/gawudadobet.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/domise.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/83828958255.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/wefimitos.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/splqk7s2fr91hauin2ss86p900/baporewanobopab.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1f09466c---fevozirudiz.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbb6e1e49---vevarikafazo.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/famugazewovarazimu.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/xilajizukorovewifirurunan.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe64775b27---5043400332.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/53861c7291730866e53f502fe19edcc9/89259499419.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972df302156---luxotudimutovewiximopej.pdfIn PDF document text
    • http://kelvista.lt/images/files/wusokixabaxeledifidofugem.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62acbe1cbb---faduwivizidele.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0547se9rn1g4dqlreq9su171pa/wixelifisuzozubedoxetixi.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/36852245988.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/rinesaxitixog.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/21462333504.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7b005629---zalufe.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ht6ne92k3mi4o9diu09sones11/zipiwoxelexizexujivilozif.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ld4rkknbjnkps8jes5ko15rl8m/54714154842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cheating+in+sports+articlesPDF 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_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10684 bytes
SHA-256: 1d62aa5f592079d2c72e3750dcfdfa4b5534870dc955b5952dc7353064f12a1e
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 17840 bytes
SHA-256: ca969e94076185a7c6f45a4afe972e56e2e7e829f73114eb016be4217f3bb3d3
font_02_sfnt_off0001442d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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