Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff98bb942438d60…

MALICIOUS

PDF

96.1 KB Created: 2021-07-20 00:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 715ee77634cb40b3affd8dc0ae8a7933 SHA-1: 0cf47425924417048bab99b0b18dd2b98262a64e SHA-256: 7ff98bb942438d602bb77fe6d09c75a802dbc625ea6f5ab395815f5239920fcc
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that points to multiple compromised WordPress sites, specifically within form upload plugin directories. These links likely serve as a distribution mechanism for malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084379396da7---subimovegubela.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe4cd82c60---sirik.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/m8smttc4j88b9dh9nju8sbg28h/30446235939.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160abf1c0198fa---dovegusiwilun.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e8545c6d4550b4ecaa45f97a082e7b60/puduxojukasukepobagimog.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2l5c90ag9tvs087t7ghbqsr0cf/95826935352.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/bakafowejujaliwe.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c6aa35f8---41378398591.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/risebazonorumuvopisakibed.pdfIn PDF document text
    • http://ekotronic.eu/files/file/momewemalodo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ibom.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/perazexowivezuxufetob.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb4c59cb4---falazonipavidugawine.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/masetijetegubamesax.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kanusugalasitavopab.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957c1695003---disulatavilemosegijur.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/26204c40da5ae7c84e1fd5436b458099/79638724822.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d73294a83781f428030baea9c0b0d0c0/fipazupopedu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/85cbdc4e54ea812268fd1cd31fd04f0a/78509208229.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/305648f8978719476b9799a62b1f04df/76526968600.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/jolijimezititafasuvexado.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0mq2qcm3iakospqf1m5221737i/vukatanomunipixalaxujimif.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24901dd953---fanatawowawamodu.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/45872065990.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/77475484731.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/66370445694.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062320041742.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/gidivedawupire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=7th+class+science+chapter+6+question+answerPDF 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_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 10924 bytes
SHA-256: 471fb93f9abe5ad6dd27a4ea6a91b8b5c4e99ab11a8f87f587a145a9900dc460
font_01_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 16648 bytes
SHA-256: 85de41fe9240fa64f99c00c4282d3b68690a206cc445d551e3737c93c38d6139
font_02_sfnt_off00014329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3A 16076 bytes
SHA-256: 0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0

Open this report in the interactive analyzer, or submit your own file for analysis.