Malicious PDF — malware analysis report

Static analysis result for SHA-256 4664aac89a08437f…

MALICIOUS

PDF

99.6 KB Created: 2021-07-03 21:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61b5702f9331453d04b002f707fe5f90 SHA-1: 531bee319a8ff15546defb250a07f10e1b99db6f SHA-256: 4664aac89a08437fefb9b9a5e4ec30e878e7864d3c9541d1aa650dc0895f68d1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6lvf8lsr4bh1bf4635mc2no3kj/53107284526.pdf In PDF document text
    • http://maychamsocda.vn/images/userfiles/file/18339344654.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/k0nhne4og7rtngq8rnecbdegiv/zafasifivokub.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/48038481234.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b8aa5997e8664d27b86e53a7f650182d/55192470107.pdfIn PDF document text
    • https://rajaunited.com/contents//files/dofadujimoboxiruliv.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/wavomijasi.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/65787712969.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/26394387401.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/29809404200.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/vonakukuxifuwerifaxoboli.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/qecafblq2d0ho4k75qa1igmrk3/vubukusuginiminepiwazos.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ca66e833877725683d4301436c611c3/64170231939.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cf1d1e58---bikewinubobiluxij.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/vewupo.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/23662642729.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210620_8E4C027D010CD235.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160746b0c96bfc---76305536724.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/28cc6fe2a265e068c1fc289b530f73e0/50784731132.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcf8ccc5d---volasokurofamuna.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zowotale.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c98ceafc6---87341113409.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/02c1540steqkiau1l61rajhds1/14082136938.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/39584380920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=draft+watermark+in+pptPDF 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_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 18672 bytes
SHA-256: b126cafcfe8313e4b057a3f21426164d4766b335ac5f997330a9ae197b1e923a
font_01_sfnt_off000151b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B8 10364 bytes
SHA-256: 60e4ad6696b0f3aec992a44976d8b452598cc6cc6e7691d873ef61aca3f740bc
font_02_sfnt_off0001692b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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