Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3615127e2efce6…

MALICIOUS

PDF

103.8 KB Created: 2021-08-10 19:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcee2cd136fb89cab5331310333ba6d2 SHA-1: 35bd5f73052c1ce7acee2afb146548b4e17ab6f8 SHA-256: fd3615127e2efce639d064a884e63181bb26708c5a9a3be0a04c89b635328b97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to obscure malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure that would typically lead to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://nibrasimansch.com/userfiles/files/kubiliwexukadixojabazig.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a40d55a68464e28b161c5082409fd867/relilolitobabajirav.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0146a6f3b---fezelobodivixamoje.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6f686ede2---safomabisonir.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddf5a09f0---jebatike.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/dufalaguwezipi.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/71789076254.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/3275470787.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/43280364427.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/86238213419.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/73530568925.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/50922658743.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/xepidepenepifazuvojofis.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/94326301955.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/46b709d96e654f90ceed22edbe047b34/16333154235.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/47702869063.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/74960026389.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/69902256518.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2bae0e34e6600bc7147ba84ec9384035/xewapilifuferoluvalod.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/bifelulizebevuguwuwel.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/8489000127.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/nekexozedasudepot.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/62950402683.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/44845432645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ejercicios+resueltos+del+libro+estadistica+para+administracion+y+economia+levinPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 20240 bytes
SHA-256: eb146ca9bf8cc3ab902b87748da739c23813e4677fe4bf6df98d34e73f8ac46d
font_01_sfnt_off000151c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169DA 11208 bytes
SHA-256: 1bedf8b1f29be4651222a331bed6a6966e54b9a4679b7356c3e6a8048370559c
font_03_sfnt_off000183d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D2 2144 bytes
SHA-256: 6679fd42b8a55a4aa47d4d6a2dfa217fcfbdffed5fa78f59badbdce75bfe0d40

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