Malicious PDF — malware analysis report

Static analysis result for SHA-256 272b90e327c45ca5…

MALICIOUS

PDF

73.5 KB Created: 2021-07-19 22:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d4acb039a2b1f058c1b9a93172bd53f SHA-1: 3efb06f5e2f91a8f9dd7d98bf9a66d06d154c0b6 SHA-256: 272b90e327c45ca52bd230ffd88115103ac94e2cbc21d17eae7c399518935f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection further support its malicious nature. The document body was unreadable, but the presence of numerous URLs pointing to potentially compromised sites suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f54d6bc9---gorosasiwetepamumopuxufa.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607631192fc7b---zajazuzutokokoruzifupejaw.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/69277395183.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70c554667---fojagusaloxukilenob.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/gotizudolanawakutu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69d218a97---sojakulasiwavov.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/depanavip.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/kfkncchnqolo8iv3f7fucc38sv/63992371746.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1884370908---valekutuguwizu.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/tamekafaxuxikijid.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6e88d4df394c0ea9f2f1282f9f0b0839/jisukokasupotijunufowepo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/075a5977eac4410bd59cefabd614cc5d/puvoxajixatetasinimepani.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/61612427024.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/unk1qi4ul6n7di09fbj5mj4kri/fanunel.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tekivokuse.pdfIn PDF document text
    • https://airshow-bg.com/file/63284167362.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7c030ecff9943d578c23fa35dec7bd49/62781857172.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c67d28415---vesazisasipisufotufanal.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210608_96993D2C4119CA5D.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/63033686399.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/38318727483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=toll+phone+numberPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acea79aeb6---68926469328.pdfIn PDF document text
    • 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_off0000c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 16192 bytes
SHA-256: 107041573e66f94877d502f7fca63b302a1e34d3993467c2a3459ba647692ffa
font_01_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 10200 bytes
SHA-256: 5ac7caf2f0279912c816a05c2424973f88555b2e2a326527b4ff0990ca3baec4

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