Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f99b47e6ba0d2d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 14:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94f92cf6f367aa582891cb761567e4ee SHA-1: 4f054eb1d797e948af79a7550e33e8253602e72f SHA-256: a1f99b47e6ba0d2d8d92d76816b82c25a7281a4c007eac7aaaeaa0fbf3de53ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS uploads suggests an attempt to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=modal+verbs+exercises+with+solutions+pdf PDF link annotation
    • https://aarhuskortet.dk/images/file/zokumaxutiganurerato.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/98756826600.pdfIn PDF document text
    • http://midel.me/userfiles/file/wesukewibasade.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/80837871604.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/suzuluvozilonigezab.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/50456983127.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/69788936460.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/veluvo.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/wejufegesisenolufaw.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f371df1ab---fozuzetisufazo.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36799508069.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4dc73b342085b03734eace4c456651f7/9827160210.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcfa72f5e---27223510963.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/jipidetuketemub.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/66928957719bfa2cd7b2e27c575190ec/jupesotuxiv.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a88da822222---boret.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610997491ab93---tefofozu.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/sulubiru.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/66748146332.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/79827159405.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72f92ce79---57833934442.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210810_936D52B94336F3A4.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/543d546029008523bebe86e988549d3b/12110029567.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/64278460959.pdfIn PDF document text
    • http://schturman.ru/files/files/gisomudofivulajofef.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/5980069196.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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 17324 bytes
SHA-256: 8996ba8bc9ea0df2419a0ce068781fd4c797a5e982116fc29815820d2dc7749d
font_01_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 11204 bytes
SHA-256: e13b2609de0806006ed5dc5229b1af1c8681beecdc3375eda4eaf54ee75f1520
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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