Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ead33283844e815…

MALICIOUS

PDF

92.5 KB Created: 2021-08-12 08:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86cfa3b126713f995fe4d0f9041c76b0 SHA-1: e33ebed4751f433cb4fccfdda8f98b9f0281adfe SHA-256: 7ead33283844e815201311586032e332bbeebe580d8cb887efefd14f8d39af92
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 a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://topimmigrationlawyer.org/ckfinder/userfiles/files/88838063729.pdf In PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fecaed6534575429bf510c96f0ad9e2e/57846086200.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/35584605827.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/47356211884.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a446c078f72---zegulezosefo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3371eef2d30105956fa308194433e5b1/68134549849.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609831b6b9031---revojajoluves.pdfIn PDF document text
    • http://yuha.be/_files/file/fufodavokebub.pdfIn PDF document text
    • http://4rrecycle.com/files/file/67699268682.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2557a6b134---jukenin.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d39185ea8---38174394208.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/89782302760.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a092734c64---sixivosefajulokisur.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qf1mpa257rpptnr3out1fvqdds/gibekukixesopavokigojikaz.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/verejuwaguzifanisubo.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/51473112105.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ba93e72bea9a73b555de5436031807b0/rumuwu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a7f111e33---46205217115.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/pajajun.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/94518267699.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3vjk442ad4c7prpqh1jjdvjttb/98722448101.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c1b1b042f0942552cf6e4a9cde45955b/67845095430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=equifax+data+breach+settlement+2021PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5feec5f5744289cb13f20cfe4d6dd389/14191430339.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_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 11384 bytes
SHA-256: 53dfd8ba686054e5928724d253d06a02616e3fd59414b32af80c8b56aa1fddd6
font_01_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 17304 bytes
SHA-256: 3a3f91b7b7cf5d4520b4945994fb7258fd9635c1c77cb98545bd5cda379c2f2d
font_02_sfnt_off00014c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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