Malicious PDF — malware analysis report

Static analysis result for SHA-256 a518c390a3987339…

MALICIOUS

PDF

118.6 KB Created: 2021-06-30 21:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1f918bffaa76f9e75153acadc6e711f SHA-1: 231e2b66fc7d9cc08f6af87bdc0480f53c88182a SHA-256: a518c390a3987339d10c22fa6f83c2f571db9d4b95c2eaabb0026d0738bdf798
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://swift-tw.com/lcc/upload/files/59202003602.pdf In PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/75f30b684002974796da5f17c83d8634/tasenugerojotaxatez.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/064b65eeac1c8c522cb9656530542f8b/sasowatabigama.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/19498973614.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/39757108360.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d017123e---48447955713.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qnbeu7gq4mfnpuqs1nt7n7io00/purizegoruzel.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/poxatapexumuleneso.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/faxonomeg.pdfIn PDF document text
    • http://heizler.hu/files/file/voruxulixopukibejenud.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5a486d482dbc3b8d7086f575b24a7152/60204231968.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/jutolaxizabamenoso.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vetotowod.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/fasarijox.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb52a8f29---latifatu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f46253b195---67815939113.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a80222bbcb1---virapor.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/nifetolarulofum.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9653d2195---rigasuxebonarunovax.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076111f405e0---81211434811.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/wiginanipaxugotuxufewid.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4d691314---ruradozanajananid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+pronounce+nineveh+in+the+biblePDF 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_off00013cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 26392 bytes
SHA-256: f5d88d20f94a24564dc9e92cfc2b19ac5adae346fddbe7ae64b18fc26e9de016
font_01_sfnt_off00017d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2B 10524 bytes
SHA-256: 37cdcd5614d1cbbfa17e0ce2e69cad8decb6452ab647e3a6507b8d6f84bbfa88
font_02_sfnt_off000194d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ace2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE2 18472 bytes
SHA-256: 707885d1e82e55f97ca061aa7196d3f5336550fd18939befd9b04c205e77d001

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