Malicious PDF — malware analysis report

Static analysis result for SHA-256 363425d7f5201f1f…

MALICIOUS

PDF

129.4 KB Created: 2021-06-30 04:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a06497df51a07b5077f17ce3577a62a3 SHA-1: f3730f2d4f2340009151ee71ee606a625a7f563e SHA-256: 363425d7f5201f1fa268aec40804bac4e3751d36403ee188afcebdecf609a91e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://anandtouristcorporation.com/uploads/wisekelotanamugazeliri.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9f0c9fdf---lifetijolexujulevaw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9fc00d10c---vuzibukafixug.pdfIn PDF document text
    • http://cutskytools.com/d/files/bapemimeverixiwunupogadid.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/sizuboxavowebajij.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/cb0526d882a3114bd9fc4171d553ccb2/84805717948.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/6241925532.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce4dc0f02---79342144748.pdfIn PDF document text
    • http://ashioke.com/images/library/File/xupafiwak.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a976f0800cc---tanomasinamu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c05e05a1c238bf0b76b913a1205f4da1/paviveluk.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/webotemus.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/julujolajoselavapiwoxoj.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cfdcff05---24472880986.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/57911515758.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/48a7f43ce218910756a22ba82cac71f5/37804851216.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/19181363677.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/jejejorig.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160793cf876870---13552380036.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fojejuju.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/30818939510.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/36c1c21f2869084dc187764a08c9cdb2/91253173698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+women+become+nunsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18728 1952 bytes
SHA-256: 204d06b3fbbdcddbcb80572d105188eb958471a3ca2b7d55681945b4d32d8993
font_01_sfnt_off00019035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19035 10488 bytes
SHA-256: b3031845a0a20b37c1c0216c7b5b62665948f65fb547999e8de9d8fa56c4e2b2
font_02_sfnt_off0001a817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A817 21536 bytes
SHA-256: 4dbac14b428c181ce678bb4a4b359c82633eaeccb0ec8385b0844f9270d5bfd0
font_03_sfnt_off0001ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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