Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d592ca2a7822e1…

MALICIOUS

PDF

91.9 KB Created: 2021-07-25 09:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c19dfd4835e17fa7f6b818620b9513b SHA-1: a0a63022387a0d5d9098a77e5b5cc08fdddc09e3 SHA-256: e3d592ca2a7822e128bb128a7243bc686678a59e9f18db40c198dc3ed0cfcb94
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/72458749705.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea26278e64---lopemupavaf.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/wagigixileletixisosijo.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/zutirenujerefebomunazi.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/73345682974.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/23782459179.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/65243626807.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aee832f0c76---pidalezibo.pdfIn PDF document text
    • https://ever-progress.com/upload/files/39480672228.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa33506f3---20859217699.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/92762015809.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096fdd385166---42204500311.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b9517d81---badixoxaverumiwirige.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607600874dffb---munutoxugibekatafukebegi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4qem5j1f9dkc7t22ertvicr4md/69190574778.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/64183860907.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfc63fc4e---96697769303.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/livalopidetomobazonuper.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/501263eb7df1e974818ec2db7642f8f3/fuxaxuperuw.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/bapasiwujonefegowom.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f67108401---41739479651.pdfIn PDF document text
    • http://tele-video.ru/upload/files/kikaterevokumu.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/2777851733.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d2401a967e8e7c9e78048da4eeca03c6/82493440507.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a05dbc7f994---sexapapowew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+free+gems+in+coc+no+hackPDF 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_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 10908 bytes
SHA-256: a18eddede2e7b06bcd3746b7a3fdeaa57c59239e8fb33a11641d942d16dc0016
font_01_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 18388 bytes
SHA-256: 106bc8435a6ded9d734a0f3ad72ddf73016933363c7f517ab99ff65f20578d07
font_02_sfnt_off00014896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1