Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0351a1bb0c3ccf…

MALICIOUS

PDF

100.5 KB Created: 2021-09-05 22:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 652632d8f84aa656a79bde6256e7d801 SHA-1: 38505e0648779491621647dc53d635830b52129f SHA-256: 4c0351a1bb0c3ccf11e04f79abe0c63fd5edf45d04827063de6dc98a28a67853
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and the link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://baggiez.net/userfiles/file/fuxorirojovivojaje.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a58814ca9---gejokubipotafigazere.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/bazibijejof.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb85086583---37611747950.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/zevug.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/51701181500.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090217484480554.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/zezekokizifewufirulem.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/31601626395.pdfIn PDF document text
    • https://autopratichesas.it/file/60064731236.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/0f6ea73890599225bc3053c5b2bb76ca/nosimenijitarogotegal.pdfIn PDF document text
    • http://sam-global.info/files/file/defokunodapazowub.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609890767876a---44930757906.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/26966427822.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/difurakuxegupikijofejuxen.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5f2422735d8f31b226b8128eb1b84305/gatafanuzojutofenosoje.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/650bf5403ceeeb45b4895a65c06f472a/wagosaxogij.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kenudolibud.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/87970040628.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dabelagilupivesujuxus.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/83976067318.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa4d767c9---32752781235.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cb6db5693cd2cfa71e56e51f234ee946/fizemopofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=shostakovich+symphony+8+score+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_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 19708 bytes
SHA-256: b15149177e2499e6adad6c8d2ff0611b6f355521eac9e41d30c08966daf4392f
font_01_sfnt_off00015164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15164 11392 bytes
SHA-256: 61e0b876cf3a05c5248baa020fa519ce9b1743e93f1e94ec3ec5b838f710e8eb
font_02_sfnt_off00016c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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