Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c1831144cf51a9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 16:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90d7c5f1b568b9603ba4120e9dfb99be SHA-1: 00c7509b2f858d56bc33f91503dcb9db07353fc6 SHA-256: d0c1831144cf51a9952f41809365aa3f1b26db2729d466724903cebf36e752fa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to potentially compromised or disposable domains, suggesting an attempt to host malicious content or redirect users. The heuristic findings indicate a link farm designed to obscure the true destination and a ML classifier strongly flagged the PDF as malicious. The ClamAV detection confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4450cdd5a---zugivixafamu.pdf In PDF document text
    • https://yuktogel.com/contents/files/duwikufik.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/96842763076.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/7248760710.pdfIn PDF document text
    • https://davaocarrental.com/images/file/difidalenunefolebumifinum.pdfIn PDF document text
    • http://klpa.net/userData/board/file/84122650670.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8aa04874d---tufifuxigabeki.pdfIn PDF document text
    • http://apvn.info/userfiles/file/naxazasobun.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/98e1850452b7a6547b2f0fb167804424/81837235421.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/wevefa.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5b136cf60e8b296b9c2b4708bd037dc2/fasutexiro.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/82614504825.pdfIn PDF document text
    • http://abwva.com/uploads/files/84421363962.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/84955320464.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/23839921810.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/29450294507.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/munivosamezamuf.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e519349a24---fizipazisubo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16072521295dfe---fozofalopejemolabagikurup.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/91374807184.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/38319514356.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/86591538113.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/burido.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/55227326060da11a26d4a948bc8e3e72/bapodula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kikkerland+clock+manualPDF 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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 10448 bytes
SHA-256: 0712c26b9a46f1a654c5a2ea0bea102c965681db5a3b4e5e710a6d0819c171d4
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 18456 bytes
SHA-256: 336398fa5901081ae91b7af02234ed68995408ebc289e25d21ed5f51d3a9eeff

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