Malicious PDF — malware analysis report

Static analysis result for SHA-256 6327542da628c178…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 11:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc950255bbfdab4284c42316687d6844 SHA-1: 1a450d6dc59b111e06d8afa2c9b96c0ec2d8e168 SHA-256: 6327542da628c178e1bceb9776020fe8fcc73c040a89d17c40c8664dc41c5618
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious PDF files. The presence of multiple URLs pointing to suspicious domains and the heuristic identifying it as a link farm strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eec23197fdcfe7f2be1967d4395ead1d/67371470659.pdf In PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/26215231816.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/1890d0c1e5da42bb83ad0ac0e62905e9/zuwadateku.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/mexosijupudatozubizitinef.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lofibebevodikijasuvi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbee0767f---vigumonelezulekoweb.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/jolete.pdfIn PDF document text
    • https://highrise.pl/file/kuruxesowanopire.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8cc7a09104031f7924247a5c347c827d/56882956745.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f259407edc---17379104430.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087449497d2e---91751399488.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/73156246528.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/1611869457.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16095e32d5cfcb---90238883417.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/9214517198.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/20937801114.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/gatejalifamejumemixirixo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vtuj23ac0vc8ahdcfkf6sa8nn1/xezuwetesazarekaliz.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/dedd12425ce2fd7a932a9d3d098bfd92/rijovi.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210605_084211.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/22405747511.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e07c2997c6---69839434032.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/47042649634.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717c6fb7b97---wekusepesuzefokebi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b404205c20d---96347052044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ielts+sample+reading+answer+sheet+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_off0000cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 17680 bytes
SHA-256: a003da7f6a9f41ed84b40228f2f603aaf9af1e023b3f5c9437555ff09e88d244
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 10864 bytes
SHA-256: b639e5ebcacf69b11d4a949c36f7a9ab6f82251e251290a7d2639f37d2c6bf6c

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