Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8d20ab043e53ca…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 07:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 875ed1b6690e19262fac76478bd707fe SHA-1: 6f89baa3c758a6ec76e43f2f18528705a278b90f SHA-256: fc8d20ab043e53ca6a8c00d944da3f183324fa44d3a48434ac4edeaf435fab65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting sites, likely to redirect users to malicious content. The PDF structure and embedded links suggest an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=which+states+do+i+have+to+quarantine+after+visiting PDF link annotation
    • http://files.ibiza-ferien.de/file/kopero.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fe509310---nebivisika.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7c2e90ad425bc48a33960d8fecee4f73/60986581087.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/0b09e84399df0f74d22e0eec3ff24840/ximoruzikexope.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/tobomeviserin.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae424f79352---14629703147.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783efb838d5---35988946756.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/86974591526.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qfroj08j2cro8u7k94j5ps986n/55857224989.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe15360c14b---kaferuziwojebesigizana.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/kozonosulupelomimifa.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/87397746565.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160810b3a9a14f---mosuxokexarufotupuzuja.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/vigiton.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/fawadeledasugutulilivon.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/zugebufabikib.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/sepivejemixipevi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608817bd373f2---17634333870.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ca018cccec5c7742c2a1b91bd1c1d56f/rekuwozajuxolibifivaf.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e800d13013---xopetelesuruwob.pdfIn PDF document text
    • https://airxps.com/userfiles/files/65046762434.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/silenubelojagiwal.pdfIn PDF document text
    • 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_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 11012 bytes
SHA-256: 192c5e0847a72d7e82b7487f26259a583c1126e13059c5eb67daec38892ca3a3
font_02_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 17184 bytes
SHA-256: ed353573158d62d61059f914ffdcfcacf31d0e675e528d9b6aaeea06fa403db3

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