Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bee82fc76457f35…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 07:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ed84e11d4e45420ab5c23711fb26c76 SHA-1: c9091c96decc5b9cd90489d8a7dae3a12b2fd833 SHA-256: 0bee82fc76457f35983d6c218f31554f1cbf77ad387307cbf47289ce9a0c19ea
204 Risk Score

Malware Insights

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

The PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. It employs social engineering tactics by presenting a download button and instructions for a password-protected archive, likely to trick users into downloading a secondary payload. The presence of numerous external URLs, many pointing to compromised CMS uploads, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=monster+hunter+portable+3rd+iso PDF link annotation
    • http://babijie.com/upload_fck/file/2021-9-5/20210905230554911585.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/nunutirux.pdfIn PDF document text
    • http://unibox.lv/files/text/lemaxur.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/jorosozokimilimoguzowas.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/iavjt59de4mtmmip21ic5j19uv/77475209894.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/826c205290a0eb2a30f7a1e00261d0af/5781199844.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ccc7b2916b300d7ef2b02b227aa949c9/sujisufob.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ee4031744ecd210dc1514c4f412e31af/12590988777.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/vivinu.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/3619562999.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/76797029812.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/siwoxapotonilupo.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/70188228811.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/38594261453.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/64b69ae36cb3bc0affa17afc383ad5b8/zurelatepijafokeretison.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/44757061441.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/lejelosumobexumoginape.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/67338911885.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d39778e6---worefaxud.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wepikorulonulasujunoratik.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/52962047989.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/roluvekapogupagikurema.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/jazur.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/882cc88584ad600e3b9deb5c56e83883/wizaweramijun.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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 19824 bytes
SHA-256: 280e3f61680ccad42ffe57111d5d17c5e192ea395a186e3bf5ae00600a58b4bb
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10896 bytes
SHA-256: 0a594e6cb3da69da9b1b883446a9c1c415fdcbf0a35301ae3df87071c4b605a0
font_02_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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