Malicious PDF — malware analysis report

Static analysis result for SHA-256 1256dddbe96bc3de…

MALICIOUS

PDF

77.5 KB Created: 2021-08-08 14:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 878f8342ead8d9ae1b0540737fdcb842 SHA-1: 6b2cacf2ca294fd87598335caec2668ccb493682 SHA-256: 1256dddbe96bc3de028a949744d93d823d21ee6f30c1bf0869c0270d3a02139b
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious sites. The presence of a 'LOLBin token sequence' in the document text indicates potential exploitation or obfuscated commands within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://irlanc.ru/uplcv?utm_term=shelly+kagan+death+pdf PDF link annotation
    • https://broadcasthub.com/ci/userfiles/files/mobawazisegunowaterusubo.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/barafor.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f903684417a03ec5a07bca7e9088ad47/sesokixotibad.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd635137e0---68392602242.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b000752673---xipunetufavezixarumilera.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tisutekelomexuj.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/57646196291.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a46le67ri888k30ckqruhv7806/24034473006.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/tprur6g70inqf80ldm4h54geif/gujokemevib.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/75102514443.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c87793ad7---sixanuge.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64abbd1cc---1076766796.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c679b51033a---46353188651.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/3179935674.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8e0c09125ef4c4dd127c0548e32dfd11/xoguxeritilufurap.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/61088572195.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f8409b23---veruzapuzuwe.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3219a2ce5---85464788249.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13bd71054---24029205221.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/merufogazurowef.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/wuxaz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1v6ab1qsic8l9gekv26dlhtai6/kidizijaxovodubezizato.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/37900531221.pdfIn PDF document text
    • http://hkalc.com/userfiles/28864573309.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecaa8705e3---90898409593.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/78770075256.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1ad66919e5ab7e8c84df38db52d6238c/92407871463.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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 17596 bytes
SHA-256: cf141e3eb44bce5f6ee5b9e34887ff512b19af2373132757b63a8c5e0adce1bc
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 10576 bytes
SHA-256: b0d8d281118742042228733ac656c2cabe3ca55108defbb2c660d28bc3b0f7d4
font_02_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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