Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc761d20cfc19b7…

MALICIOUS

PDF

91.3 KB Created: 2021-09-20 20:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2dff99cb1ece7f1c49127331a3c964f5 SHA-1: dff1372ece5d1449ecff43c5ba45f487ca8b7098 SHA-256: 7dc761d20cfc19b710ac7982f0a051a9fb6f0b42e94c91b89ac1b930bc50e31f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of a malformed exploit stream and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm are indicative of techniques used to deliver secondary payloads or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://medvor.ru/uplcv?utm_term=sims+freeplay+free+money PDF link annotation
    • http://studiofelician.com/userfiles/files/71109264330.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445739356e8---28700368587.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/30876828710.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/dafibi.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/tamire.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/lunusoxawuxa.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/vifuxaroxusepenawolekolem.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/83741269790.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/zofovuzuvediwi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6263eefc5---80034395671.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/73557942471.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/90664710359.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/8576890497.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/59421906697.pdfIn PDF document text
    • http://pk.mo/userfiles/file/78155270777.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/61299897763.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/mudexaguzawidodamuzi.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/lutisil.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/25903676d93b925bfc2c84ecd80d9098/bazajesuvuvedemosuvaru.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a5957c41---luvaxagobujugigofi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efc8d0587c---27943920643.pdfIn PDF document text
    • http://santeh.md/img/files/safivo.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/niperatemonaxur.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/juwavodujupexeked.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/xutos.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_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 10608 bytes
SHA-256: 8a073a913612aa6bcc99974d54975a392d34005b69b31fe6e4fb17ab33f3f303
font_02_sfnt_off00012ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF8 18140 bytes
SHA-256: 9f3ecd39bf7aa442f2e7a6c8e8c48bca51bcb4fafeee91740334d43a72857d19

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