Malicious PDF — malware analysis report

Static analysis result for SHA-256 845dbd52174f0a7b…

MALICIOUS

PDF

82.2 KB Created: 2021-07-01 17:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 380ba959cc6bcc37970b3f07446cd402 SHA-1: 890957cd96622f4311c1f776a639c06854bd1597 SHA-256: 845dbd52174f0a7bed2a2c63621028e2c24bb3635da36f880caee7797c266634
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a98c70537cb9b0f2a288992aa360a15f/siwos.pdf
    • http://arredamentoambienti.it/img/file/toridavunalifatifovixaf.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2add153ca5d7ea5b30a3b1eeb68d1b3/jopujomenuwewepon.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5ddeea826cfe136e739abbab9bf8f852/27243128904.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/56096f90a8d1e669f81eb77982514fe7/21945956730.pdf
    • http://location-appartement-venise.com/italie_documents/files/30624544590.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e37d24929---kobazew.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/fomemagutopurejijog.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc33c2145---pesujoki.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c4b400a1817302cf77b21f93cc3c7360/18961230292.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/6602219c222b80816e7712e1e8d8cc44/10849445058.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fbcfc30946ba893976737aaadc6d71b1/regasosorofujawo.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/83upl193p4m4imboao5k8q56vi/wegokidixunirawakoxeliv.pdf
    • https://jerseyshorepirates.com/userfiles/files/bagudojagumuranuxi.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41dc856e9---gopake.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa505bad61b---vejizepot.pdf
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/tizarun.pdf
    • http://stlnsk.ru/uploads/file/gugasokik.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b83d3e51---loweloxeboniwezefovi.pdf
    • http://ambulanceservice.pl/userfiles/file/vupapaku.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/cece020d10d274a566f5fd358036fce8/wafebukejeganome.pdf
    • http://popnmusic.fr/userfiles/file/83446889294.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=all+food+nutrition+chart+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e014.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 16792 bytes
font_01_sfnt_off0000f826.bin
b813dc102f6f6fe9ca232e2f0011e70d7c189685cc448bd9a486eb6d5db212a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16776 bytes
font_02_sfnt_off000123c8.bin
4bf6c5f76280e6b9581cae49280470d2fd12fe48bda6ebe42e641707ebc2f6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 10500 bytes