Malicious PDF — malware analysis report

Static analysis result for SHA-256 d920bc96371c976f…

MALICIOUS

PDF

100.3 KB Created: 2021-07-20 13:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 963d1d76d43a1ab7cf508d597748ecb7 SHA-1: 50d46986698c0b9638b3cab9130785832f6ae93d SHA-256: d920bc96371c976f90c6e2fbd68cc2b11610f34594dcdcc0f0091420d531716b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

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://www.bufolari.com/public/immagini/file/26514149855.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca0fd9ede---zexuzasifakudowekowumarim.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/471b5a6009649dcce50254cfa1443664/bazekedi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/iq3gb42tpl9b31pu97f9lk7s8e/15196238472.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/71730253498.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/3e5dd2a4b6a4f03735cc9bbf57da710c/89443149538.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/28958986284.pdfIn PDF document text
    • https://cargotavio.ru/files/file/85089787092.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf495f2c69---37583738185.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be520dbdad8---dagukevijodagamolumubi.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/xamobipipanerorukunen.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/80691438512.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/41492611245.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/70644588412.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7a405d065144eed09122ac640a9193ce/16181442243.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/lalego.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/79325306848.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/xifipipigeloludurajog.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084142f11504---supugipino.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/29b6c95818e6aace36e279f23139741b/kabivezakasokufesegafezu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1376e5162e---wavokejiviguxuji.pdfIn PDF document text
    • http://schubert-hh.de/image/file/nizukokodukosutumafi.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/napewezijedu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3f16d943---83921621571.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///61886543189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=accidentally+in+love+kiss+asianPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16268 bytes
SHA-256: b386d9056a900824ec2c762c9a86b28d0f37cc36a5ea339cdc2f9d7a1723a461
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 10516 bytes
SHA-256: ce53d19615d58455eb8d5a0858659d5ded8905086dbb343d46028764932d17df
font_03_sfnt_off00013822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 17664 bytes
SHA-256: 1d8d4e123d9f9ef54e7a808466e90681bcb5c3984b9a92426390a690178575f7
font_04_sfnt_off00016590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16590 8244 bytes
SHA-256: 1cfb7fa2dc96ea6b5401237dc6355da0ca51b23b74735cbedef8a658f461129e

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