Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeba39d5cb7c033…

MALICIOUS

PDF

85.4 KB Created: 2021-08-11 04:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bbe0f9dfe47f60adf64f595d33c022ae SHA-1: cf84dbab9126153657fe9f89ebf5941440394bb4 SHA-256: deeba39d5cb7c033171c8ebb7a0b1bf75c87b826aef97ce626c7eacaeb81c88a
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160700d9b30729---muvom.pdf In PDF document text
    • https://dbjadow.pl/attachments/file/bopatanoz.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/43091944055.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/14893539659.pdfIn PDF document text
    • http://alltechsro.cz/files/nedatalanobife.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/aojrjatj2bsnufqc8v88f0rlr4/zawebipo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/09e87a48bea34ba22b6205ecef89c2da/25668376605.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b942b1cc118---diwedi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7959e2eac---21042187163.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/37684451669.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f9104590---21605205683.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/98087706054.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/10008003773.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/mizuzowekujodonenuf.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d730180d7e---10522405366.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa81e5986---fagurasa.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/4630699736.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/25713685745.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160814c34654fd---geriroxonatozoniberisef.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2bfdbe0730e9a7a302e799284ed0caef/kugugumefasapoponabiwiw.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ftc0vpq7tqvucf0shu35efhk33/kalovujulexumefer.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/fapasegipopoporajiv.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/57859546052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=whatsapp+aero+v8+51+apk+downloadPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/eef69fcd4c4dca182d3e1ef664d05d62/wajikitazig.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_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 11028 bytes
SHA-256: 428113e184a0b96b156431a259a4771c6b2850946a08c4714c4f679e5fd02d9e
font_02_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 17168 bytes
SHA-256: 3436196fa653c6fa72da0952fdce57689af4b3691418cfa04364dfc938b500e3