Malicious PDF — malware analysis report

Static analysis result for SHA-256 a548c53f711d2bf6…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 04:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f093f59a63657366763cb0f9d7f4c2e0 SHA-1: c588399f9b22b1f07f74e34fa2e57adafa3462dd SHA-256: a548c53f711d2bf6066ba389ade270fe87ddee3ee184299ef3047b2963b86451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=expanding+difference+of+perfect+squares+worksheet PDF link annotation
    • http://wsm.hk/images/uploadfiles/file/tamawagaliputuselipos.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8d2b232adf760f1cd2a6f45a7797d42a/13390665719.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/demonavatamujig.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/21705960320.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/u22309luj85p4paqld5cflp2v6/56057961758.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/vemanapegodasinesugowoli.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vikeveneliwiwozabepavo.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/xejejazepesatavi.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/jewilojowib.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/71550060957.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161319522449f9---tisadituxupuxupuzo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16120c3f003fb7---99353706802.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/xupasurenoradevifimev.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e42f25b6b3---18791086241.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7724044549.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/34088158675.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/21871820230.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/75430946588.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/10412487172.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/23a72ea7662a1b611a226cc579955927/78021768429.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607127e44987c---pufosapamaxizadudutepim.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/tibulisej.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/22928949295.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_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 18256 bytes
SHA-256: cde0c7b473adb7200a0f4be99a0af59ee7e7d02e96978f84cc2e4a9f3a8c576f
font_02_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 11364 bytes
SHA-256: ea1d0c23d213c39e0f4bd83907d7c99be6e966601686735dfa38d5ab179121cb

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