Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b3c0398410e9d0…

MALICIOUS

PDF

92.8 KB Created: 2021-08-03 09:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac63da5fe0f1cc831327e177f5332f02 SHA-1: 08645dd954d8e4dde3474004fe9a7ddf2bfad7b2 SHA-256: a8b3c0398410e9d053fb8f82f01ecb375988be55864c9dd8934aacbc71c80d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a234fa331c0---2662751979.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501163442880375.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/789dlcpjr3gind49emrdf86ro7/dukusitisokezaxofobiroji.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bsieil3vq91l8krqarj2t8s971/topawewi.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/51731357607.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210718124349.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0dd2e143f9e26faeae1bbda12fc33b9c/dafenus.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pusudoned.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/208dd3c2438feb61fc23724cdaf7cbdb/27406931475.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22723cc68---lovutivimos.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/radomunitogafovexiwutapo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6584b1b9c---74132833355.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/9146441672.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/gumutomobifomirilewuzup.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/18677560267.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/fewojug.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/zanovunevomemimof.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7288bcebbed144f85b75a02a299c9f8f/tixot.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a332f8b1b0---43505898369.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3df1d30a9---lowoxanelokevebizumujo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/026d7db33e58798dacf69f7ff79edddc/tibuburotigifimivigebuv.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/970518266.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6nvmugnt7fnnpc2pfflh4pjis1/bipifadapebatibokenuwaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+hide+cholesterol+spots+with+makeupPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 10944 bytes
SHA-256: fc0aa6b2f14f0812c9c2c44f922067cb78ab8263ba340e2b4d958782e7841a1e
font_01_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 18772 bytes
SHA-256: 09b93cf11d44fed597e07dc5c31702316b9e5b44de26b400436babfe48b898d2

Open this report in the interactive analyzer, or submit your own file for analysis.