Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dac85b0e7aa3d9…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 06:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8789008c4ff51771a6094be110ae3b29 SHA-1: a40f2bb129f6543d033abcb922539ca68438578d SHA-256: 36dac85b0e7aa3d93d6f79f2e10ed162988926a07c4769838515ca7f308033e0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing payload or further malware. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 8

  • 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.
  • 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://samavetpharm.com/userfiles/files/90430596905.pdf In PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/kemodudosulemugagepur.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wapibepexozupolamopadamaw.pdfIn PDF document text
    • http://normel.org/files/upload/file/45263913056.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/vuxita.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f38c6e88a0e---simetajotupexuduvagug.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f834fa365f5b04db3efd4be8c59042a4/rutewiluta.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/86jav1gce8buofibqbmv5ujm1t/78562182856.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e0957d02963dff7e70bdf891c7470cc4/nepatemijolos.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///42287764112.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/51915775193.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/varhrng1rr44am0rc090bn8ea4/mebubufi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43818c069d---73907012152.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/tevapejagekoporodife.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/tofagekerile.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bisabosidatadepirekekuful.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/26467183579.pdfIn PDF document text
    • http://talleresjpg.es/img/file/90057731721.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/62317055552.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/54230489788.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/tonuxawasilebami.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c1155bfc8afa382ef3cf76da4a4ce102/2932790261.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/kaditukutekafiz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079281bd669a---nigufatemef.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/46371895658.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/ziwezilodewigug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=general+knowledge+2020+manohar+pandey+pdf+downloadPDF 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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 11160 bytes
SHA-256: 7439d17ce630e6f9cb0e79ab546ef02c75b0362f372dd98aba32e9323cf8341f
font_02_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 20468 bytes
SHA-256: 2797690b1c606f4c59152282a29ecd7b61fe72dc3ebeea19688dd01e7bfb1967

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